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.
 
You must log in or register to reply here.

Similar threads

sickman
Can't get my RODI to go below 1.2 TDS in Palm Beach County (SE Florida)
Replies
5
Views
111
Twisk
Twisk
sickman
Filtering out Chloramines in South East Florida
Replies
11
Views
251
griss
griss
M
Well water TDS 10
Replies
4
Views
573
wvned
wvned
Mr31415
RO unit: DI resin depletes quickly
2
Replies
25
Views
3K
Mr31415
Mr31415
U
Problems testing Phosphate
Replies
6
Views
1K
Timfish
Timfish
Back
Top