[72fishboy]

Got a four stage R/O unit that I have had for about 3 weeks and I’m not getting as pure water as I would like. My TDS meter is reading 7ppm, I know you want it to be as close to 0 as possible so is 7ppm high?? My source is piped w/ a “y” split off my washer. Is it possible that it’s not getting enough pressure because it’s sharing a water supply?

[Waterlogged]

Some people will say 1 is to high. I have read up to 10 is ok. I guess you'll have to use your best judgement. Try checking saltwater.about.com

wrong website, check this
About Saltwater Aquariums - Reef Tanks

[NATIVEVAMAN]

There seems to be two things that make r/o units work at less than peak effiency. Pressure below 60 psi and cold water.Remember chemical reactions are more efficient at higher temps.Not to hot though,around 75 should do it.

[120gallons]

What the tds of your tap water?

[Waterlogged]

Mine is 450.

[NATIVEVAMAN]

There seems to be a problem determining that fact here in Richmond.I have had mine tested 3 times with three widly varying answers from 145 to 300+.So either the water quality is inconsistant or the meter at the lfs is(or both).

[72fishboy]

yeah my tap water is 145

[rlcline76]

I was under the impression that tap water can vary from day to day. If I was getting RO water of 7 ppm, I would change the filter. That is just me, though.

[crxman]

ok so i have my ro unit taped into the cold water line how would i get my water temp to be 75?

[glampka]

You could try adding hot water to it. Or you can have your water system plumbed with a tepid water system. It automatically mixes hot & cold water.

[Mattfish]

It could also be that the filters that came with your RO/DI unit were not the best. At Glampka's suggestion, I got mine from Air, Water, Ice and it's a 5 stage. Our tap water was 225+ ppm before the RO/DI, and with the RO/DI unit, it's at 0. We run it from our cold water line as well, so it would seem that the filter quality makes a big difference, as does the # of stages.

[crxman]

is it possible that i could put a ball valve like i have on the cold water line and just control the water temp coming out of the hot water line or is there a better solution?

[stephaniesquires]

Not sure this would work, it's early, coffee hasn't kicked in yet and I'm getting a cold, with those disclaimers stated: what about a "reverse" y setup. I have my RO/DI on my washer also so I can picture your setup. I would try this - Y the hotwater hose also, one going to the washer one for the RO/DI, then take the hoses from the hot water and the cold water and attach to another Y - the RO/DI unit can now be attached to the hot/cold Y. Not sure how the temp control would be, (or if it would even work at all) (there would be Y's - one on cold, one on hot, and one which combines both)...
You try it first and if it works let me know

[Rainman69]

I was under the impression that temperature only affected the amount of product water and not quality. Also I have always rejected the first gallon are so;but having recently installed an Inline tds It gives a reading of 0 from get go. So now I'm not sure If this is necessary.

[Mattfish]

Typically, it's only the first gallon or two after a new filter or unit install - but not the first gallon everyday. Again, unless you have old filters or infrequent use and the filters are disintegrating.

[KevinMS]

Finally got my filter setup this past weekend...Incoming water 270 tds...for the first day product water was 004, Checked again today and its 000 ..must be doing its job

[Mattfish]

That must be nice to see and it's good piece of mind.....