[keyser soze]

i currently produce around 5000 litres of pure a week and the ro and pre filters knock it down to 26 to 28 depending on its mood . so you can imagine i can get through a lot of resin . my question is would it be more cost effective to produce the water to 28 into one tank and then boost it into a 2nd ro into a second tank and hopefully knock it down to 2 to 3 ?... anybody done this ?... thoughts and comments would be greatly appreciated and thanks in advance .my tap tds is 350 ish

[steven ainger]

Sounds like the problem is with you existing ro,
What ro is it & Why is it only taking it down to 28 ??

[keyser soze]

i thought that was about right . it supposed to knock it down 95 per cent which is about right

[Goldoak cleaning specialists]

Your ro unit should take your water to 5 or under even from tds of 300ppm.

Something isn't right somewhere.  Try a new membrane hf 4 hf5 very good. Flush your membrane for 2 days while you fill if its an option.  Unlike the suggested 1hour a week

[Don Kee]

95% of a tds of 350 is 12/13 or less.
My tao tds is around 370 ish and the r.o takes it to 7/8 depending on how it feels.
I would say your membranes may need changing....

[easy clean]

5% of 350 is 17.5, wanna do my vat return for me? 

[gto]

my RO takes in at 450ppm and give out around 10ppm.
so your is definatly running high, have you tried adjusting the pure to waste tap.
if you slowly adjust your waste output higher it may give a lower pure reading.

[keyser soze]

you are right maybe i should boost it through my ro  as my tap pressure isnt brill

[Stephen.C]

Look at your pre filters then your ro and so on.

[Fin Clearview]

Sorry to jump in but I have a similar problem, I've owned a new 300gpd ro from PF since August. With an pre ro ppm of 250 it used to bring it down to around 10ppm but recently it has been around 21ppm. I changed the pre filters about 2 months ago, and produce about 2500L every week. My psi pre booster pump is about 45. I just don't know why it's crept up of late?

[sean c]

i find it depends on the water from the tap i'm in Dorset the water is well hard lime scale [calcium ]
so from the tap first port of call is carbon sedement filter x2 then a water softner which i backwash religosly to regenarate it then through the r/o the membrane is 3 years old also i flush the r/o out weekly
i also run 3 25l resin pots i last brought resin about 14 months ago
i dont no if this helps you but it works for me cheers sean keep um squeaky clean   

[easy clean]

Why do you feel the need to run 3 vessels

[luther1]

The 95% purity theory only works in an ideal situation. The further your ro is from your tap,the lower the pressure will be,hence higher Tds. If I fill up at the front of my house,tds out of ro is 6,fill up out the back and it's 84. I would suggest a pre ro boost. All this membrane changing is nonsence,I've had my current one 5 years.

[robert mitchell]

Im using a lidl booster pump througj low pressure 4040 ionics /pure20 system .

250 in 4-6 out .

[luther1]

Your ro unit should take your water to 5 or under even from tds of 300ppm.

Something isn't right somewhere.  Try a new membrane hf 4 hf5 very good. Flush your membrane for 2 days while you fill if its an option.  Unlike the suggested 1hour a week

Try a new membrane? So,spend £250 and hope for the best. Flush for two days? Ffs

[robert mitchell]

I have never flushed mine for more than ten mins , it flushes while its producing anyway .

[dave0123]

Every situation is diffrent mine brings the output down to 23 today.. sometimes down to 18 nothing lower than this.. Theres nothing wrong with my membrane.

Its the fact that my water pressure is so low it is  distance away from tap but i cant get around this any other way. also the water flow per min coming out of tap isnt amazing the tds of my tap water is 361 today sometimes 380 390.


Its not worth saying to him his membrane is knackered... it can be a whole host of different things! i had a long conversation with june at gaps water explaining to me the reason why it cant come down any further even with it being boosted.

But my next membrane will be the lower pressure ones

[Goldoak cleaning specialists]

Your ro unit should take your water to 5 or under even from tds of 300ppm.

Something isn't right somewhere.  Try a new membrane hf 4 hf5 very good. Flush your membrane for 2 days while you fill if its an option.  Unlike the suggested 1hour a week

Try a new membrane? So,spend £250 and hope for the best. Flush for two days? Ffs

Yes 2 days!!.I flush my membrane from sat morning sunday morning to Monday morning every week. My tds in is 187 and 000 at the other end of the membrane.  It also goes through  2 di vessels after the ro.my water has been 000 for 2 years now

Particles become blocked under low pressure and the only way to remove is a min of 24hr flush. I know what im talking about I used to make them in the states for 18 months 10 years ago.

[Ian Lancaster]

Your ro unit should take your water to 5 or under even from tds of 300ppm.

Something isn't right somewhere.  Try a new membrane hf 4 hf5 very good. Flush your membrane for 2 days while you fill if its an option.  Unlike the suggested 1hour a week

Try a new membrane? So,spend £250 and hope for the best. Flush for two days? Ffs

Yes 2 days!!.I flush my membrane from sat morning sunday morning to Monday morning every week. My tds in is 187 and 000 at the other end of the membrane.  It also goes through  2 di vessels after the ro.my water has been 000 for 2 years now

Particles become blocked under low pressure and the only way to remove is a min of 24hr flush. I know what im talking about I used to make them in the states for 18 months 10 years ago.

I'm struggling with that.  If the TDS at the 'out' end of the membrane is 000, why do you need to put it through two DI vessels?

[Goldoak cleaning specialists]

Easy ian. Its the way the system is set up. If my ro ever does go high the 2 di vessels will clean the water in time for A me to order and B the delivery and possibly delays.

My line of filters consists in this order. .tap. pre filter. Carbon pre filter. Ro. Di 11lt..di 27lt.tank.000 every time.i make 750lts of water every day.