Clean It Up
UK Window Cleaning Forum => Window Cleaning Forum => Topic started by: rycalshaw on April 16, 2025, 01:36:38 pm
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Hi guys' will using larger membranes speed up my water production ? ' i'm currently using 100gpd membranes but the production is painfully slow. Cheers
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Hi guys' will using larger membranes speed up my water production ? ' i'm currently using 100gpd membranes but the production is painfully slow. Cheers
Hiya !! I think the answer is yes, larger membranes will speed up your water production.
Lets take a look at what you said........'i'm currently using 100GPD membranes'..... well GPD means Gallons Per Day.
You could pop a search into Ebay for 450GPD RO kit , thats probably gonna give you something a whole lot faster.
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Hi mate' thanks for your reply ' i should have said 100gpd x3 membranes' would moving up to 450 as you suggested mean upgrading my 3 membranes to 150gpd each..thanks
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Hi mate' thanks for your reply ' i should have said 100gpd x3 membranes' would moving up to 450 as you suggested mean upgrading my 3 membranes to 150gpd each..thanks
Yes. However - although they are still 10" they are wider and you may need wider housings. I'm not sure.
Sometimes it's cheaper to buy a whole discounted RO when you add up all the costs of the various upgrade bits.
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Hi guys' will using larger membranes speed up my water production ? ' i'm currently using 100gpd membranes but the production is painfully slow. Cheers
How long does it take to purify say 500L water?
I've ordered a 4040 HF5 RO and im hoping I'll be able to purify 500L in 3 hours with no booster pump
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Hi guys' will using larger membranes speed up my water production ? ' i'm currently using 100gpd membranes but the production is painfully slow. Cheers
How long does it take to purify say 500L water?
I've ordered a 4040 HF5 RO and im hoping I'll be able to purify 500L in 3 hours with no booster pump
i have an ibc tank and to fill it it takes around 5 days...
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Either
1 You have a very big IBC tank
2 You have low water pressure
3 Your membranes are shot
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Hi guys' will using larger membranes speed up my water production ? ' i'm currently using 100gpd membranes but the production is painfully slow. Cheers
How long does it take to purify say 500L water?
I've ordered a 4040 HF5 RO and im hoping I'll be able to purify 500L in 3 hours with no booster pump
It largely depends on your water pressure.
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Hi guys' will using larger membranes speed up my water production ? ' i'm currently using 100gpd membranes but the production is painfully slow. Cheers
How long does it take to purify say 500L water?
I've ordered a 4040 HF5 RO and im hoping I'll be able to purify 500L in 3 hours with no booster pump
i have an ibc tank and to fill it it takes around 5 days...
5 days? That's absolutely ridiculous! Surely changing the membranes will help speed it up
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Hi guys' will using larger membranes speed up my water production ? ' i'm currently using 100gpd membranes but the production is painfully slow. Cheers
So by the sounds of it you’re using a 10” RO.
Upgrade your membranes to 150gpd membranes (making it a 450gpd) and add in a booster pump (aquatec 8800 is decent)
Personally though, I’d consider buying a 4040, especially seeing as you have an IBC.
I understand the price difference can be a little off putting in comparison but once you have one you wont regret it.
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Hi mate' thanks for your reply ' i should have said 100gpd x3 membranes' would moving up to 450 as you suggested mean upgrading my 3 membranes to 150gpd each..thanks
Yes. However - although they are still 10" they are wider and you may need wider housings. I'm not sure.
Sometimes it's cheaper to buy a whole discounted RO when you add up all the costs of the various upgrade bits.
150 gpd membranes will fit into the standard housings.
I did that. However, if the o/p thinks he is going to get a vast increase in water production, this won't happen.
Personally, a 450gpd processing water into a 1000 litre ibc tank was more than enough for me working on my own. But with 50psi water pressure it took a good 28 hours to fill my ibc tank to 850 liters in summer. I could add another 12 hours to that in winter.
I have a float switch on the tank which switches the water off to the r/o when the tank is full.
When my son joined me in 2008 the r/o wasn't enough to supply both of us. A bad weather day did help.
If the o/p needs a high production rate, then it's a 4040. When I changed over to my 4040, I was in awe at the water production rate. I was getting just on 2 litres per minute of pure in summer with 55psi water pressure and no booster pump with an Axeon hf5 membrane.
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Hi guys' will using larger membranes speed up my water production ? ' i'm currently using 100gpd membranes but the production is painfully slow. Cheers
How long does it take to purify say 500L water?
Hi daz I have a hf4 40 inch ro tap pressure 60psi,I’ve not measured water production but I reckon I can produce 300 to 350 l in three hours,as above not measured just a rough guess
I've ordered a 4040 HF5 RO and im hoping I'll be able to purify 500L in 3 hours with no booster pump
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Hi guys' will using larger membranes speed up my water production ? ' i'm currently using 100gpd membranes but the production is painfully slow. Cheers
How long does it take to purify say 500L water?
Hi daz I have a hf4 40 inch ro tap pressure 60psi,I’ve not measured water production but I reckon I can produce 300 to 350 l in three hours,as above not measured just a rough guess
I've ordered a 4040 HF5 RO and im hoping I'll be able to purify 500L in 3 hours with no booster pump
My experience is that Colin is about right with his guesstimate. Even with a 4040, processing water in winter takes longer than when the water is warmer in summer into autumn.
When my HF5 was new in the September, I got just short of 2 lpm of pure. During this past winter I've noticed it wasn't producing the same as it once did, so checked the rate. I was getting fractionally over 1 lpm. It has since improved a bit but will do another check after Easter when I'm back at work again and drawing water.
I process water into an IBC tank in the garage. I need to draw about 200 litres before the r/o kicks in. I've done this purposely so the r/o runs as efficiently as possible for the longest time before it switches off when the tank is full.
I also have my r/o on a timer so process water overnight when we aren't using water after we go to bed. Just to ensure that I don't flood the garage should anything go wrong, I do have an overflow hose to an outside drain.
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Hi guys' will using larger membranes speed up my water production ? ' i'm currently using 100gpd membranes but the production is painfully slow. Cheers
How long does it take to purify say 500L water?
Hi daz I have a hf4 40 inch ro tap pressure 60psi,I’ve not measured water production but I reckon I can produce 300 to 350 l in three hours,as above not measured just a rough guess
I've ordered a 4040 HF5 RO and im hoping I'll be able to purify 500L in 3 hours with no booster pump
My experience is that Colin is about right with his guesstimate. Even with a 4040, processing water in winter takes longer than when the water is warmer in summer into autumn.
When my HF5 was new in the September, I got just short of 2 lpm of pure. During this past winter I've noticed it wasn't producing the same as it once did, so checked the rate. I was getting fractionally over 1 lpm. It has since improved a bit but will do another check after Easter when I'm back at work again and drawing water.
I process water into an IBC tank in the garage. I need to draw about 200 litres before the r/o kicks in. I've done this purposely so the r/o runs as efficiently as possible for the longest time before it switches off when the tank is full.
I also have my r/o on a timer so process water overnight when we aren't using water after we go to bed. Just to ensure that I don't flood the garage should anything go wrong, I do have an overflow hose to an outside drain.
I'm getting a water pressure gauge from screwfix today. I'll just screw it onto my outside tap and hope it's good pressure.
What would be a good pressure reading for using a 4040 HF5? 60-80psi?
No sign of RO yet. Hopefully it'll get delivered next week.
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37psi.....I don't think an HF5 4040 will even work at such low water pressure will it?
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37psi.....I don't think an HF5 4040 will even work at such low water pressure will it?
i think it will work daz at 37psi but will be very slow,due to low pressure not being able to force the water into the ro,so there will be a lot of waste.
what ive noticed here is when southern water drop the pressure my ro syill works but at a much slower rate
my mate has hf4 tap psi 40 it still produes pure but at a slower rate compared to me
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37psi.....I don't think an HF5 4040 will even work at such low water pressure will it?
Just get a decent booster pump
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37psi.....I don't think an HF5 4040 will even work at such low water pressure will it?
Just get a decent booster pump
Thankfully the HF5 membranes still produce a high volume of water at very low water pressure so I think ill be ok mate.
Purefreedom will not allow me to buy a booster pump with a HF5 4040 membrane on their site as there's simply no need for it.🙂👍
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37 psi probably won't be the running pressure. The pressure drops when RO is running, as opposed to just taking a reading on the gauge when no actual water is running to be processed by the RO. You will need a booster pump.
The pressure will probably increase a little overnight because there is less demand on the water supply generally.
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37 psi probably won't be the running pressure. The pressure drops when RO is running, as opposed to just taking a reading on the gauge when no actual water is running to be processed by the RO. You will need a booster pump.
The pressure will probably increase a little overnight because there is less demand on the water supply generally.
We live in a cul de suc and are at the end of the water supply ring main. The supply pipe sprung a leak across the road before the first house in our cul de sac. It took the water board a week before they came to sort the leak out.
Our water pressure was down to 40 psi. We still had enough water to work with. I didn't measure the water production rate but instead of a rejection rate of 3 from a tds of 125 it was 5/6 ppm for that week.
Another thing daz may want to consider is to replace the waste gate valve if he is buying the r/o from PureFreedom. PureFreedom supply a gate valve with a hole drilled in the paddle.
If he purchases a like for like one from a plumbing supplier, then he will be better able to better adjust his waste water, knowing that he must never fully close the valve.
I had to close my water valve more when our water pressure was low or else our waste to pure ratio was wrong.
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37 psi probably won't be the running pressure. The pressure drops when RO is running, as opposed to just taking a reading on the gauge when no actual water is running to be processed by the RO. You will need a booster pump.
The pressure will probably increase a little overnight because there is less demand on the water supply generally.
It's all trial and error as I've never even used an RO yet. I'll see how I go on when it finally gets delivered.
As I've said purefreedom do not allow you to add a booster pump to the HF5 membrane option on their website.
I really don't want to be purifying water overnight for 10+ hours just to have 500L for my next days work. What an absolute pain in the **** that would be. I want to be able to fill my tank in 3 hours then lock my van up until my next days work.
If it's too much of a faff I'll just have to stay DI only with 2 x 25L vessels and take the hit.
It'll cost me around £2k a year in resin to stay DI only.
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Hi guys' will using larger membranes speed up my water production ? ' i'm currently using 100gpd membranes but the production is painfully slow. Cheers
How long does it take to purify say 500L water?
Hi daz I have a hf4 40 inch ro tap pressure 60psi,I’ve not measured water production but I reckon I can produce 300 to 350 l in three hours,as above not measured just a rough guess
I've ordered a 4040 HF5 RO and im hoping I'll be able to purify 500L in 3 hours with no booster pump
Thanks Colin
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(http://www.cleanitup.co.uk/smf/1745050368_Screenshot_20250419_091202_Photos.jpg)
Found this on an old post from years ago from Paul Coleman.....
This is exactly my situation! Water pressure just under 40psi,HF5 membrane and no booster pump and tap tds of around 200.
4 or 5 hours would be acceptable as I'm normally home by 3pm so to be able to purify 400L by 7 or 8pm daily would be ok.👍🙂
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If your order has not been put together yet Daz I would get them to change it to HF4 with a booster pump, otherwise you run the risk of spending a lot of money on an RO that just will not perform well.
Like I said, the actual running pressure for the system most likely will be lower than the static pressure reading you took with your gauge. Even if you do get 37psi, I think that is on the low side for your system to work well.
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If your order has not been put together yet Daz I would get them to change it to HF4 with a booster pump, otherwise you run the risk of spending a lot of money on an RO that just will not perform well.
Like I said, the actual running pressure for the system most likely will be lower than the static pressure reading you took with your gauge. Even if you do get 37psi, I think that is on the low side for your system to work well.
Cheers mate. I'll phone them on Tuesday and see if i can change it.
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https://purefreedom.co.uk/products/high-volume-reverse-osmosis-systems?Membrane+Size=20%27%27&Membrane+Option=HF4&Option=Booster+Pump+%28Inc.+Controller%29
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The above is what you need dazmond
This one I have i produce 200 ish per hour
Even at 100psi going in to machine you loose 50 to 60 percent psi by time it comes out into tank if you fill tank before di you will fill it a bit quicker
Then fill van tank through a di bottle
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The above is what you need dazmond
This one I have i produce 200 ish per hour
Even at 100psi going in to machine you loose 50 to 60 percent psi by time it comes out into tank if you fill tank before di you will fill it a bit quicker
Then fill van tank through a di bottle
Even that seems slow. Danny says he can fill his 450L tank in around 90 mins with no booster pump. He has the HF5 4040 though...
Does the booster pump not cause water pressure loss in your house?(eg if you have the washing machine on and running a bath)
I don't think my missus will be impressed if it affects water in the house 🤔
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Im gonna check our stopcock is fully open tomorrow as that could affect water pressure. We recently had a new shower fitted and they had to turn the water off and they might have opened it fully then closed it slightly with a quarter turn which is common practice with some plumbers.
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Im gonna check our stopcock is fully open tomorrow as that could affect water pressure. We recently had a new shower fitted and they had to turn the water off and they might have opened it fully then closed it slightly with a quarter turn which is common practice with some plumbers.
Double check how the outside tap is connected to the other pipework. Sometimes they use the self piercing tap things that are designed for washing machines but they severely restrict the flow.
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The above is what you need dazmond
This one I have i produce 200 ish per hour
Even at 100psi going in to machine you loose 50 to 60 percent psi by time it comes out into tank if you fill tank before di you will fill it a bit quicker
Then fill van tank through a di bottle
Even that seems slow. Danny says he can fill his 450L tank in around 90 mins with no booster pump. He has the HF5 4040 though...
Does the booster pump not cause water pressure loss in your house?(eg if you have the washing machine on and running a bath)
I don't think my missus will be impressed if it affects water in the house 🤔
Yes it does effect the pressure in the house
When I first bought it. 5 years ago I Had a hf5 fitted and booster pump and yes it was quicker. But It's fine for me.
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I moved into a new build five years ago and was connecting up to outside tap that was teed off of kitchen tap water pressure was low I was told that due to house having a vented system fitted for hot water and central heating water pressure is reduced to protect vented system.
I then teed of the incoming mains between water meter and house and fitted a tap in between I now have 60psi at the tap and have no filling issues
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My tap pressure is now 40psi after turning my stopcock on full so still low but the 4040 HF5 membrane is supposed to be the only effective low pressure membrane manufactured to handle such low pressures.
I'll probably have to be very diligent in changing the 20 " pre filters as apparently the membrane can easily get clogged/damaged and these membranes are £500+ to replace so I'll have to be careful. Also I'll have to flush for 5 mins every day or once a week for 30 mins according to the research I've done up to now.
Tap tds is currently 213 so I'm hoping the RO will get this down to single figures to negate the need for resin.
I've had it easy since I switched to WFP 15 years ago with Tap tds of around 025 so this is all new territory.
I'm hoping it arrives before my holiday on May 8th.(ordered on the 6th April) but as Purefreedom manufacture these in house and all the bank holidays I'm not confident at the moment so it's costing me a fortune in resin. It really is eye-watering how much I'm going through! ::)roll