Hey freshly mixed instant ocean is reading 0.24 phosphates!!!

[Natescorals]

Hey anyone experience this? I’m trying to figure out the cause of this. I’m mixing fresh RODI water with a TDS reading of 0. My water quality here in Lake Tahoe is already very clean. When I mix instant ocean for 48 hours I’m getting a phosphate reading of 0.24. Is this normal? I am testing with a Hanna ULR.

 

[TheShrimpNibbler]

Have you tested your RODI wager for phosphate? I see that it says 0 tds, but could there still be phosphate in it?

 

[Natescorals]

Have you tested your RODI wager for phosphate? I see that it says 0 tds, but could there still be phosphate in it?

I only have the Hanna phosphate. I’m not sure If you can test freshwater with that can you?

 

[OutLawX77]

check with Hanna on line

 

[AJsReef]

Which Hanna meter do you have? BRS sells 713 and 717 as fresh and saltwater.

Also, what TDS meter are you using? Have you checked calibration

 

[Uncle99]

Check for phosphate in your RODI.
Almost all cities put phosphate in their water systems as it prevents corrosion.
Mine shows .1 after DI.

I run phosphate between .1 and .2

 

[Natescorals]

I’m using a very cheap TDS meter that I got on amazon. It says my tap water is 89 TDS and my RO water is 0.

 

[Natescorals]

Check for phosphate in your RODI.
Almost all cities put phosphate in their water systems as it prevents corrosion.

If my water has phosphates why won’t my RODI unit remove them?

 

[Natescorals]

It’s a brand new RO unit that I just got from BRS.

 

[AJsReef]

Second what others are saying, test your RODI for phosphates. I would also check your TDS calibration with 342 solution.

Where I live in North Florida. I had to add additional DI canisters to ensure no phosphate/silica made its way into my RODI. I used BRS “Pro” line up separating cation and anion. Sure enough, I consume anion much faster. Then before it reaches my RODI tank I run it through a silica buster as a safety net

 

[Natescorals]

I’m running a little bit of phosgaurd in my tank. The water looks crystal clear and my corals look very happy and are all growing well..

 

[Natescorals]

Check for phosphate in your RODI.
Almost all cities put phosphate in their water systems as it prevents corrosion.
Mine shows .1 after DI.

I run phosphate between .1 and .2

But are RODI units supposed to remove the phosphate? Or does the phosphate stay in the water. My nitrates are undetectable using Salifert nitrate kit

 

[Flippers4pups]

Good read:

Aquarium Chemistry: Phosphate And Math: Yes You Need To Understand Both

Foods are by far the most important source of phosphate in most aquariums. In considering whether sources of phosphate other than foods are important, one must carefully look to the actual amounts involved to determine whether other sources are even worth trying to minimize.

reefs.com

If your TDS meter is reading 0, then there's a good chance that it's a testing error with the Hannah.

A good TDS meter will show a value if you have that much P04, even with phosphate being weakly attracted to the Di resin. On the other hand, If you have new resin and it shows a reading 1+ and stays that way, most likely the phosphate is coming from you source water.