NEW RO/DI question

[ReefOne]

My 6 stage i got from filterdirect is acting up. I've had it for 6 months and i've made probably 100 gallons tops and my tds went from 0 to now 10-14. Any idea what it could be. My reading in is around 45-560, it varies.

[alton]

Water in my TDS runs between 185 and 225. Is the 10-14 after one gallon or after 2 or more?

[ReefOne]

both, it doesnt change. It stays between 10-14

[alton]

I would say change your filters Micron and Charcoal and see if this helps. I think they go bad just sitting around? Your membrane didn't dry out for what ever reason did it?

[ReefOne]

how do I check that?

[BuckeyeHydro]

New question... I borrowed a TDS meter from brewercm (thanks brewercm) and checked the 30 gallons of RO/DI i made last night. It tests at ~69. I made a small amount just a minute ago and it tests at 14. Can I assume that this will continue to to get closer to 0 as the filters get worked in or is this out of the ordinary?

P.S. My tap water tests at 300+

Your DI water should be down in the neighborhood of 0 to 1 ppm tds. Lots of things can cause higher readings:
-a tds meter out of calibration
-a contaminated sampling vessel
-old DI resin (that may or may not have been burned out too fast by a bad RO membrane)

[BuckeyeHydro]

My DI units don't last very long (200 gals.)so I put my TDS meter in front of the DI so I can monitor when my charcoal and micron membrane start to get bad. If you have the drinking water attachment or water polisher to the end of your RO unit this will add things back in. Aquariumfilters.com answers many of these questions.

Your sediment filter and carbon block have negligible effect on the total dissolved solids. Read/record/monitor tds levels in three places:
1. tap water
2. after RO but before DI (to monitor performance of your membrane)
3. after DI (to monitor performance of your DI resin)

[BuckeyeHydro]

My 6 stage i got from filterdirect is acting up. I've had it for 6 months and i've made probably 100 gallons tops and my tds went from 0 to now 10-14. Any idea what it could be. My reading in is around 45-560, it varies.

Does that system have a GAC cartridge AFTER to DI? If so, carefully consider why you would want that stage there. It surely will not further purify DI water - it will add tds. Don't expect 0 or 1 tds out of the final stage if its a GAC cartridge.

[AlienAnchovies]

as far as ro goes does it have anything to do with the growth and overall health of ones corals?
or is it simply to stop pest algaes