Kyle's 55 gallon Reef

[BLAKEJOHN]

Ha, my water is so crappy I spent my membrane in six months. The TDS was up to 20 after the RO and of course 0 after the DI (I replace my carbon and Sediments evey 2 months). Put in a new membrane and am back to 2 TDS after the membrane. I just have crappy well water.

[Mike O'Brien]

Your membrane should last you many more than two years. You may not be removing the Chlorine and Chloramine before the RO which will ruin it. You need to evaluate the rejection rate of the RO to see if it's bad.

rocedure:1. Measure tap water conductivity. (Call it X)2. Run the system for 15-20 minutes.3. Rinse test instrument cell 2-3 times with RO water.4. Measure RO water conductivity. (Call it Y).5. Subtract RO water conductivity from tap water conductivity. (X - Y)6. Divide this quantity by tap water conductivity. (X - Y) ÷ X7. Rejection = [(X - Y) ÷ X ] ×100* Conductivity in the above procedure could be replaced by hardness, alkalinity,nitrate, phosphate, silica etc. (Measured in ppm or mg/l).Rejection of the RO Membrane Calculation Example1. Tap water hardness = 150 ppm (X)2. RO water hardness = 7 ppm (Y)3. X - Y = 143 ppm4. (X - Y) ÷ X = 143 ÷ 150 = 0.9535. Rejection = [ ( X - Y) ÷ X ] ×100 = 0.953 ×100 = 95.3Membrane Hardness Rejection = 95.3 % : Rejection rates less than 95% mayindicate that the membrane should be replaced.
--------------------------------------------------------------------------------

This is why I always say to have the water tested first, or find out from your town what is in it. With the right system, the RO membrane can last upwards of 5 years.

[FiSHy sAy HeY]

I will be purchasing a DI addition, salt, and a refractometer soon.

In the mean time I am going to frag all of my xenia.

[FiSHy sAy HeY]

Havent been on in a while....everything is growing but I have a problem...

Hair algea is all over my rocks in my tank. My TDS is 0. I am starting to do 3 gallon water changes a day...do you guys think this will fix the problem?

[Rickyrooz]

How old is your TDS meter? Are you sure it's accurate?
Check out this article, it's a good read.
http://www.manhattanreefs.com/forum/...es-callin.html

[FiSHy sAy HeY]

TDS meter is brand new. And I just changed out my RO filters

[FiSHy sAy HeY]

And what eat hair algea?

[GSELLERS1245]

sea hares

[FiSHy sAy HeY]

Will 3 gallon water changes eventually kill off the HA?

[reeferbro0622]

Originally Posted by FiSHy sAy HeY

Will 3 gallon water changes eventually kill off the HA?

I would do 10 gallons weekly. But it won't help if your ro/di water has high tds.