Can't keep the PO4 down. Running GFO for months.

Zoa.Mania

Active Member
View Badges
Joined
Jul 30, 2019
Messages
141
Reaction score
111
Location
The House That Jack Built
Rating - 0%
0   0   0
Hello everyone I retested with another checker (ULR) and we got 71ppb. I retested with mine with the same cuvette making sure we did it on the same glass cuvette and got 74ppb. Very very light blue almost unrecognizable compared to a few months back when it was dark royal blue.
74ppb = 0.074ppm

This is within acceptable range. You’re good
Don’t do anything just keep it under 0.1 ppm and you’ll be alright

Good luck
 

paragrouper

Valuable Member
View Badges
Joined
Feb 9, 2023
Messages
1,667
Reaction score
7,326
Location
Shady Shores, TX
Rating - 0%
0   0   0
Are you using a Hannah “Phosphorus ULR?” That is the one that reads in parts per billion. The phosphate ULR reads in parts per million.
The reason this is important, there is a conversion you must do from phosphorus to phosphate. In your case 74ppb (phosphorus) would convert to 0.218 ppm (phosphate). The link below is to a handy conversion table from Hannah.

Link
 

Zoa.Mania

Active Member
View Badges
Joined
Jul 30, 2019
Messages
141
Reaction score
111
Location
The House That Jack Built
Rating - 0%
0   0   0
The reason this is important, there is a conversion you must do from phosphorus to phosphate. In your case 74ppb (phosphorus) would convert to 0.218 ppm (phosphate).
Forgot all about it. Probably since I use ULR phosphate checker.

So 0.2 phosphate still a bit high IMO but I know some systems doing just fine with that.
If you don’t experience any problems like algae and all corals looks ok (especially sps) I wouldn’t bother lowering the rate, just keep it stable and make sure it doesn’t spike again.
 
Last edited:
Back
Top