[sunshine windows]

I currently run a Purefreedom 450 gallon per day RO and have recently replaced all membranes and filters.

The unit runs with a mains booster pump to enhance performance, when I first installed the pump I could get the reading down to 4ppm before DI resin.

After just replacing everything, the lowest reading I can get is 10.

It was only reading 27 before I replaced it all and I'm wondering was it worth it.

Could it be that the pump is not pumping sufficiently or could it be that the membranes aren't doing as good a job as the original ones.

Interested to hear your views

[DaveG]

My 450 gpd Ro with booster (85psi) has only ever got it down to between 14 and 17 before resin, I thought this was normal??

My mains tds is around 320

[johnny bravo]

i use a 350 ro,     from tap = 148tds.
with booster pump running before ro it goes down to ,  11  then 7 then 6,         then i will put into di vessel,      wait for around 5 minutes then it will go from 2 or 1   then down to 0,    then it goes into 220 butt, ready for harvesting
ive just got another 220 butt from aldi,       down to £18  from £28
we love a good deal

ive been thinking of getting a 450 ro,
has anyone went from a 350  to a 450 RO system,      any difference in water production

[johnny bravo]

with my P.F. booster pump i get 210 litres in 3 hours  it used to take 8 hours

[Jonny 87]

450 GPD ro from Doug at daqua.

No booster pump.

090 TDS in.

000 TDS out.

Then I put it through a DI vessel just for good measure.

 

[sunshine windows]

Thanks for the input guys.

Looks like mine is performing about the same as most others then.

No idea how it used to make 4ppm when I first bought it.

[Jonny 87]

Thanks for the input guys.

Looks like mine is performing about the same as most others then.

No idea how it used to make 4ppm when I first bought it.

What's your input TDS?

[sunshine windows]

Over 300. Around 350-380 I think

[Tom White]

Over 300. Around 350-380 I think

That's almost mud.  Mines 160 and comes out, before DI, about 6 I think.

[sunshine windows]

Just checked the RO reading and it's now coming out at 5 ppm. Much happier 😀

[slap bash]

If a R O is funtioning correct it should bring your TDS down to 10% of the starting amount so a 330 tds should come to 33 and less if higher is not in good shape. I was told by gaps and have proved over the 8 years I have done windows, but RO membranes quality will differ. If I cannot get my ro down to 10% I will never buy that membrane again. I only use the 150 gal membranes from Gapps as they are fantastic and work well for many years. I am on my second set in 5 years. Quality.