Phosphate Problem

igadget56

igadget56

Member
I have high phosphate readings straight out of my RO/DI. This is the one I have.
I just replaced All the filters except the RO membrane. Why would I get these
high readings of .11 to .09. Tap water is 352 TDS. After RO membrane TDS was always 2 now it is 3. I replaced all the filters with originals. I thought phosphates
could not get through DI resin. I am using a Hanna HI 736 phosphorus meter. I have tried a different lot# and get the same thing. I don't have another test kit
to try.

http://www.airwaterice.com/product/1TYPHOONIII/TYPHOON-III-AQUARIUM-RODI-75-GPD-or-100-GPD.html
 
I suspect you're seeing a measurement problem, personally. Phosphate should be removed pretty well by the RO/DI filter. What's the reading at the tap?
 
Help

Help

I got a hold of another Hanna HI 736. I did a lot of testing with 2 different lots.
There was almost no difference. That's not good. Tap water was .40 RO/DI,
.10. I took the RO/DI water directly from the hose so I don't think it's contaminated .If I don't get this figured out that's going cost me a lot of GFO for a 210. I have an idea. I make my SW in a 50gl Brute. What if I would dose that or my ATO water with lanthanum chloride and filter it with a diatom filter? I still have one somewhere. Please give me some feed back. If I did how much to dose
( I know, depends on what product I use). And how long to run the filter? I don't want to put any coral in until I get this figured out.

Why isn't the DI resin removing the phosphates. Help.
 
I have the same problem,my tap water is high on phosphates.I tried few things,puting more GFO is not a good decision,you will got unstable level of PO4 in your tank.After many hours of reading and consultation I found out that RO mebrane is poor on phosphor remving,DI should do it.But if your PO4 is high like mine than that is not enough.What I did now,I doubled the amount of DI and my problems are gone.I guarantee this best way to do it,but you should monitor the outlet of your ro/di and change DI on time.
 
Is .40 really that high. Ok I will order it tomorrow from BRS and I will have it on
Tuesday. I will keep you posted. Thanks.
 
0.40 is high enough that I wouldn't want a tank to run at that level. I probably would spend some money on removing more phosphate if the RO/DI output were that high. Do you mean that the RO/DI was at 0.1 ppm?
 
Hmm, some of that difference might be noise in the testing, but I think I'd expect a good RO membrane and fresh DI to do a lot better. I might start checking the TDS levels before the membrane, after the membrane, and after the DI. 352 ppm at the tap is fairly high, though. I might try a second DI cartridge for more removal if the TDS after the membrane is very high.
 
That's a very good number. If the DI cartridge is okay, then I'm not sure what's happening, but I might try another DI cartridge or some GFO, whichever was cheaper, to see what happens.
 
I just remembered I had another Dual TDS meter. I hooked one before membrane after filter 3 TDS was 244 is this ok


1 10 micron
2 5 micron
3 1 micron
4 membrane
5 DI
I will add another DI
 
This is not good, I'm so P##%%D. I put the 2nd DI filter on still getting 0.11
I got some distilled water same thing. I burned through almost 50 tests in 3
days. I found 2 packets of another lot#, (this makes 3 lots) tested my DI
with, now 2 DI's .05 Tested the distilled .04 So I still don't know whats going on.
3 lots, 2 meters and 4 cuvette's. Makes me want to just quit. I have been waiting 4 months to put in some coral.
 
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