[johnny bravo]

just replaced my old filters for new,     as nothing goes right scenario,    my old filters were reading 15   coming out pure before di,    just replaced filters for new,      flushed for around 1 hour,    now coming out at 16 /  18 ,   totally bewildered.   

these are filters by viair   recomended for my system.

im re flushing again to see if it goes down.         i was hoping for a reading of about 10.     

i thought it would go down not up,

anyone had this happen.

all placed in correctly.

[dd]

Do you mean membranes or the pre-filters?

If membranes you could try taking a tds reading for each membrane individually to see if one is duff.

[Afterglow Window Cleaners]

If you mean you have replaced the membranes, then it will take a couple of weeks for them to perform at their best. When I replaced mine from vyair also, they started off at well over 20ppm before di. After a couple of weeks they were at 6ppm before di and are currently 7ppm now.

If you mean pre filters, then changing them wont affect the ppm.

[Spruce]

just replaced my old filters for new,     as nothing goes right scenario,    my old filters were reading 15   coming out pure before di,    just replaced filters for new,      flushed for around 1 hour,    now coming out at 16 /  18 ,   totally bewildered.   

these are filters by viair   recomended for my system.

im re flushing again to see if it goes down.         i was hoping for a reading of about 10.     

i thought it would go down not up,

anyone had this happen.

all placed in correctly.

Johnny,

Our water is 120ppm at the tap. Yours won't be far off that. Your output tds should be around 2.

RoMan told me many years ago that you must buy good quality American made membranes - the ones made in China cost a little less but the joy of a low price will soon be replaced by the higher resin costs due to poor quality.

The last lot of membranes we bought were  Filmtec membranes, supplied in those days by RoMan.

Daqua and GAPS Water supply Axeon membranes, also a quality product from the States.

A difference of 5ppm after the membranes will cost you £4.00 a month in extra resin producing 5000 liters a month.
Our last 450 GPD membranes last 7 years.
 

[johnny bravo]

no not the membranes ,  the pre filters,    thats why i said filters.

so changing the pre filters does not really bring down the   tds .ppm.

its been coming out of the ro     at 14    before going into my 2 x  10inch DI vessels

i thought buying new pre filters may have brought the readings down a bit.    but no difference

[johnny bravo]

my tap water is 148,           leaving 300 RO  @  15,      before  going into  DI vessel.

i go through around 1000 litres a week,   filling a 220 litre butt up,   using pure freedom booster pump,  takes around 3 hours to fill 220 litres.

i use the 300 RO + 2 10inch  DI vessels joined togeather.
this is my cheapest option for making pure

[Spruce]

Sorry. Misunderstood.

Perhaps that's because your rejection rate of 15ppm is too high.

At a 98% efficiency your rejection rate should be 3ppm after R/O.

At 15ppm with the input tds of 148, your membranes are only 90% efficient. Time for them to be replaced.

[johnny bravo]

 

[johnny bravo]

cheers Spruce,
ill look for those membranes

[pure tech]

I replaced the membranes in my 300gpd RO with  ones from Gardiners and they are brilliant.  Tap water is around 80ppm and am getting a reading of 000ppm after membranes.

[johnny bravo]

im checking sites now for best deal on decent membranes, same named  but around £20 difference

[johnny bravo]

decided to go with vyair,      a well known company,      easy to contact,       FREE DELIVERY. this is why i purchased from them.

3x100gpd membranes    £90.46p  + free delivery.

other companys sold cheaper but there delivery took it over the £100 mark,

i was going to get 3x150 membranes   to make my ro a 450gpd,     but they said they would not have any extra impact on producing more quicker. pure water

[Spruce]

decided to go with vyair,      a well known company,      easy to contact,       FREE DELIVERY. this is why i purchased from them.

3x100gpd membranes    £90.46p  + free delivery.

other companys sold cheaper but there delivery took it over the £100 mark,

i was going to get 3x150 membranes   to make my ro a 450gpd,     but they said they would not have any extra impact on producing more quicker. pure water

Absolute rubbish.

Our first r/o was fitted with 75GPD membranes. They couldn't be guaranteed to fill a 375 liter tank of water overnight.
Those where upgraded to 150GPD and the difference was very evident.
That 450gpd kept the 2 of us with enough water everyday for 5 years.

When you want genuine information to make a decision they aren't the company to rely on in my own personal experience.
Look at the amp draw on their wfp pumps.
The 5 LPM pump draws 5.8 amps;
the  7 LPM pump draws 3 amps;
the 10 LPM pump draws 8 amps;
and the 12LPM pump draws 10 amps.

I asked them 3 times to confirm the amp draw on that 7 LPM pump. I got no response.

Now I could have taken that draw as gospel and ordered 2 pumps to replace my Shurflos as I would have only use 1/2 the battery current a day running 2 pumps.

As I said earlier. It isn't about the initial price. You saved a tenner on their cheap poor quality membranes. If your rejection rates are five points higher than a quality brand, then  break even would be in 2 1/2 months. If those membranes last you 5 years then those cheap membranes could cost you £230.00 in additional resin costs.

 “The bitterness of poor quality remains long after the sweetness of low price is forgotten” – Benjamin Franklin

[dd]

Spruce, how do you know they are rubbish membranes? 3 x 100gpd membranes (Axeon) from Gaps water are around £77 plus postage, so the price seems about right to me.

[johnny bravo]

AMFOR TW30 1812,  100

they werent cheap,
normal price £32,        searched for discount and got 5% discount,

 they opperate at low pressure , producing 20% more water than other membranes.    So they said

The Brands of RO membranes include Vontron, CSM but the outstanding membrane that operates at much lower pressure than the competition. Amfor Domestic RO membranes sold by Vyair operate at the low pressure of 50psi where most operate at 60-70psi.  The Amfor TW30-1812-50, TW30-1812-100 and TW30-1812-150 produce 20% more water than competitors membranes operating at higher pressure. Why high quality materials, latest  Reverse Osmosis Membrane Technology

[johnny bravo]

 
I can only try Spruce.       They were only cheaper as all the other companys had delivery charges,  some as much as £12 extra.

[johnny bravo]

Reverse Osmosis Membranes
 

There are huge differences in the sizes of actual membranes from small 10" domestic reverse osmosis membrane right up to membranes as large at 40". Vyair will shortly stock a range of both 40" & 21" Ultra Low Pressure RO Membranes from Amfor Inc, these American Membranes offer Ultra Low Pressure Commercial RO Membranes. The low pressure membranes that you can obtain the maximum amount of pure water from a membrane at the lowest possible operating pressure. You can operate you 40" membrane at a pressure of 80psi or 100psi. The pure water output can be as high as 9 cubic metres of water per day.

Along with the large commercial membranes, we offer and extensive range of 50gallon, 100gallon  and 150gallon membranes that fit inside a standard Reverse Osmosis  Membrane Housing.  Vyair offer low pressure domestic membranes that operated effectively at pressures as low as 50 psi, most membranes need 60psi to operate efficiently. This means that the ro system will produce more water at a lower pressure

A range of Reverse Osmosis Membranes for both Domestic and Commercial Applications. The range of Membranes include 40" and 21" High Capacity Reverse Osmosis Membranes from the American Membrane Company Amfor. 

Amongst the Domestic Membranes that are  used in Marine RO water Filters, Domestic Drinking Water Reverse Osmosis System, Pole Window Cleaning Pure Water Systems and RO Pure Water Filters for use with Hydroponic Plant Nutrition.

The Brands of RO membranes include Vontron, CSM but the outstanding membrane that operates at much lower pressure than the competition. Amfor Domestic RO membranes sold by Vyair operate at the low pressure of 50psi where most operate at 60-70psi.  The Amfor TW30-1812-50, TW30-1812-100 and TW30-1812-150 produce 20% more water than competitors membranes operating at higher pressure. Why high quality materials, latest  Reverse Osmosis Membrane Technology
 

[johnny bravo]

well new membranes in,      all flushed,      pure now coming out at 008   before DI,   without booster pump. 
ill have it on tomorrow with booster pump.
they were actually the same make as my old ones ive had in for around 3 years

[Spruce]

Spruce, how do you know they are rubbish membranes? 3 x 100gpd membranes (Axeon) from Gaps water are around £77 plus postage, so the price seems about right to me.

Time will tell. Johnny is getting a rejection rate of 8ppm from his tap water which is 148ppm.
That's an efficiency of 94.5%.
Those membranes should be more efficient than that being new.

[dd]

Assuming the water pressure is decent, yes he should get better than 008. The membranes are new though so the tds should improve with a bit more use.