[dazmond]

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.

[dazmond]

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

[dazmond]

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.👍🙂

[dd]

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.

[dazmond]

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.

[M.c.s]

https://purefreedom.co.uk/products/high-volume-reverse-osmosis-systems?Membrane+Size=20%27%27&Membrane+Option=HF4&Option=Booster+Pump+%28Inc.+Controller%29

[M.c.s]

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

[dazmond]

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 🤔

[dazmond]

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.

[Ched]

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.

[M.c.s]

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.   

[colin bird]

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

[dazmond]

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!