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Old 08-12-2004, 11:22 PM   #1
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RO water and Phosphate

With all the talk of cyano outbreaks, I have noticed that my red slime problem seems to be getting worse too. I siphon the stuff and it is back the next day. I have tried the many tips and such with feedings, water flow, etc. but never actually purchased a PO4 test kit.

I bought one at the LFS today. It is made by aquarium Pharm but it is all they had. I am getting a reading of .5 in the tank and also in my RO/DI water! I tested the water in my holding container and right from the hose itself. Can I do a membrane flush to fix this? Now that I think about it, since I have been making my own water, the cyano has really seemed to get a good foothold on my tank!

What can I do here?

BTW, I have the 100 gpd system from Aquasafe.

Thanks
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Old 08-12-2004, 11:37 PM   #2
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It sounds like your DI resins are spent and need to be replace. The RO membrane doesn't affect Phosphates....it's the DI cartridge that does.
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Old 08-12-2004, 11:38 PM   #3
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Personally I would run some phosphate remover for a little while, and keep syphoning. Just do this for a wek or so as patience is sometimes the key.

I'm not sure about the RO/DI filters ablity to remover Phos from the water, but you only need a very small amout to fuel algae.

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Old 08-12-2004, 11:41 PM   #4
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I have a similar problem. I have a 2 stage RO unit. I just added a 3rd stage, a deionizer. It brought my source water PO4 from.25 down to nearly 0.
Just a though, cost me $50 but if it fixes the problem it will be worth it. I have tried everything else.
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Old 08-12-2004, 11:42 PM   #5
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I am running seachem phosguard - have been for about a week. My DI cartridge is only about a month old. Should not be spent, really. I have some spares so I could give it a shot.

I read that quarryshark had a phosphate issue and he added a DI cartridge to his RO unit and it took care of it.

If I swap out the DI cartridge do you have to run water through it before using it?
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*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,
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Old 08-13-2004, 12:09 AM   #6
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Nope....However, before replacing resins that are only a month old, verify that your test kit is reading properly.
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Old 08-13-2004, 12:25 AM   #7
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Quote:
verify that your test kit is reading properly
LOL, not sure how to do that other than order a different kit Maybe the LFS can test for PO4. I'll have to see tomorrow.
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*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,
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Old 08-13-2004, 12:51 AM   #8
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Good luck Ellis. Keep me posted. I'm interested to see how it turns out. I will keep you posted as well. This is one of those pain is the backsides.
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Old 08-13-2004, 12:08 PM   #9
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Any RO experts know if the DI filter is what removes the phosphates? I have a final carbon stage that is for taste. I do use this even though I don't need to. This would not cause any issues would it?

I am going to try and take some water in to a LFS today but I don't know what kit they use. Usually Aquarium Pharm. Could I get some distilled water from the grocery and test that? Would that be a good enough test to see if the test kit I have is accurate?
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Old 08-13-2004, 12:19 PM   #10
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I tested my RO vs my tap water vs my system water to see if there is a different. There was a big difference.
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