[andy east sussex]

is it sediment before carbon filter or other way round ?

[Walter Mitty]

I do sediment followed by carbon.  It's worked OK for years so I imagine it's the right way around

[HALTON]

Sediment first   

[andy east sussex]

cheers guys thought so also would a warm sediment filter effect water pressure as just got a 3 stage ro 350 gallon system off flea bay and pressure looks only 40psi after carbon filter not sure what is it before sediment tho

[HALTON]

If second hand I would change as you don't know how long it's been used for.
Sediment cartrages are only just over £1
http://www.wintecs.co.uk/catalog/debrissediment-filter-5micron-10in-spun-poly-p-456.html

[andy east sussex]

http://www.ebay.co.uk/itm/381230358414?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT#shpCntId

I could use that pump couldn't I to boost the pressure I know only cheap but surely that psi be up to the job

[SeanK]

The sediment filter is there to protect the carbon filter as they wouldn't be long getting blocked by sediment
and yes if your sediment filter is blocked by sediment it will slow down production as it reduces the water pressure to
the RO.
Always change both.

[andy east sussex]

sadly ive just changed pre filters only have about 50psi going in is approx. 280ppm and coming out of ro is coming out at 20ppm is that ok for polishing

[Soupy]

sadly ive just changed pre filters only have about 50psi going in is approx. 280ppm and coming out of ro is coming out at 20ppm is that ok for polishing

Not too bad, could be better I'd think. What type membrane do you use?

[andy east sussex]

its one of those 4 stage jobbies with a 350 gallon a day membrane but just don't have any pressure to fill it fast

[Walter Mitty]

sadly ive just changed pre filters only have about 50psi going in is approx. 280ppm and coming out of ro is coming out at 20ppm is that ok for polishing

I would have some resin after it somewhere to make sure.  You might get away with it but if there's a spotting issue, knowing that your TDS isn't the cause will help to figure out what's causing it.

[SeanK]

sadly ive just changed pre filters only have about 50psi going in is approx. 280ppm and coming out of ro is coming out at 20ppm is that ok for polishing

The lower you can get your RO tds the better as the resin will last longer, but you should still get good value from it at those
levels.

[Soupy]

its one of those 4 stage jobbies with a 350 gallon a day membrane but just don't have any pressure to fill it fast

As far as I'm aware an increase in pressure should decrease the tds as well as increase production.