[tatman]

got a 40inch ro (pure freedom). The tds reading seems to be creeping up after around 4 weeks is this normal. I change the filters every 12 weeks im only using around 250 litres a day.
So wait for tds to reach around 005 then change resin. Seems alot of resin to go through?

[Alex Gardiner]

Have you been given instructions on how to flush the membrane?  If so, you ideally need to flush the membrane for about 5 minutes before each tank fill.  This will prolong the life of your membrane and make it more efficient.

[windowwashers]

got a 40inch ro (pure freedom). The tds reading seems to be creeping up after around 4 weeks is this normal. I change the filters every 12 weeks im only using around 250 litres a day.
So wait for tds to reach around 005 then change resin. Seems alot of resin to go through?

You are best calling Andrew at purefreedom,

I personally added another resin vessal to save on resin, because chucking resin that low is a waste IMO, I will ditchin mine at 001

[tatman]

yes alex i flush through for 20 minutes at least 2 or 3 times a week and always for 5 mins on each fill. Originally tds was staying down for over 6 weeks but noticed a jump to 002 this time after only 4 weeks? does seem a waste of resin and it aint cheap either.

[windowwashers]

yes alex i flush through for 20 minutes at least 2 or 3 times a week and always for 5 mins on each fill. Originally tds was staying down for over 6 weeks but noticed a jump to 002 this time after only 4 weeks? does seem a waste of resin and it aint cheap either.

are you testing the tds out of ro ?

if not do it and see what it is, you could well be shutting off after the flush and not giving enough waste.

add another resin vessal you will use alot less resin than you are now

[Alex Gardiner]

yes alex i flush through for 20 minutes at least 2 or 3 times a week and always for 5 mins on each fill. Originally tds was staying down for over 6 weeks but noticed a jump to 002 this time after only 4 weeks? does seem a waste of resin and it aint cheap either.

What ratio is the product/waste set at? Sometimes increasing this slightly can improve the performance of the membrane.

As Ian has said twin DI canisters will greatly increase the life of the resin and save you money.

[tatman]

ok ian will have a look 2mor now cheers for the advice.  

[tatman]

ok alex i will also send more to waste cheers and see if it stays at 000 longer.

[Wayne Thomas]

Sending more to waste will lengthen the life of the RO membrane. Adding a second DI will better use the resin and save money spent on unnecessary resin.

[tatman]

tds reading straight out the ro is around 210 does that sound about right ian?

[windowwashers]

tds reading straight out the ro is around 210 does that sound about right ian?

No way, that way ott, flush your system for about 20mins then check it again.

it should be less than 30

[tatman]

flushed for 20mins got a reading of 118tds. After passing through resin gets down to 002. And that resin is 4weeks old! I have flushed the system on a regular basis any ideas. Dont really wanna be using new resin every month is that normal?

[tatman]

 

[windowwashers]

flushed for 20mins got a reading of 118tds. After passing through resin gets down to 002. And that resin is 4weeks old! I have flushed the system on a regular basis any ideas. Dont really wanna be using new resin every month is that normal?

118 is not good enough,

flush it for 30 mins and see it it changes, if not go back to supplier and ask why this is happening either you have a dodgy membrane, or your tds is sky high and need a softener....or you tap pressure is so low it takes an age to get through and the watse will be a nightmare.

I have gone through this myself.

118 out is totally wrong

30 max and thats from normal tap.

try flushing longer even an hour and a little more each day 5 mins is not enough in a very hard water area I know this as my tds is over 470.

if it does not drop there is a problem with the membrane

[tatman]

ok mate will give it a real flush through over weekend and see if that makes it drop. If not ill be ringing pure freedom monday because will be spending money on wasted resin

[tatman]

oh and by the way is a real hard water area in northants the tds is up in the 400's as well so prob not helping

[d s windowcleaning]

ok mate will give it a real flush through over weekend and see if that makes it drop. If not ill be ringing pure freedom monday because will be spending money on wasted resin

pure freedom could well be shut on monday mate as its a bank holiday .

[alanwilson]

sounds like

a) you may need a water softener
b) your membrane is fitted the wrong way around - there is a rubber seal on the inlet side of the membrane, make sure it is on the inlet.
c) faulty or damaged membrane.

Assuming inlet tds of 450ppm, typical rejection should be around 95/98%, therefore outlet tds should be around 22ppm however in practice the higher the inlet tds the higher the rejection %, I would reckon anywhere from 010ppm to 020ppm would be about right.

[jaykie]

all this talk is blowing my brains, i hate being a newbie as havent got a clue what your talking about but feel i need to as got a purefreedom system myself about 3 weeks ago but only ever put water in it twice.

Chris

[windowwashers]

sounds like

a) you may need a water softener
b) your membrane is fitted the wrong way around - there is a rubber seal on the inlet side of the membrane, make sure it is on the inlet.
c) faulty or damaged membrane.

Assuming inlet tds of 450ppm, typical rejection should be around 95/98%, therefore outlet tds should be around 22ppm however in practice the higher the inlet tds the higher the rejection %, I would reckon anywhere from 010ppm to 020ppm would be about right.

I was getting down to 24 min normally 28/30 in very hard water area.