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Discussion Starter · #1 ·
I ordered some monopotassium phosphate from an online store and it arrived blue. There was a note in the box that said it is just a colorant and sometihng about supply problems in getting the non-colored stuff.

Has anyone used the blue stuff? I don't want my silicone turning colors and there are lots of blue colored things in the chemical world...
 

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I too am curious about any long-term side effects of using the smurf phosphate.
I received the same stuff from aquariumfertilizer.com when I first started using EI, about 2 months ago. The note was in with my batch also, something about a shortage of KH2PO4?
I haven't noticed any obvious staining yet in my 5.5 gallon, my only tank with visible silicone.
I made up a solution of KNO3 and KH2PO4, (1.5 tsp KH2PO4 in 450 ml water) which you can see next to the jar of the dry KH2PO4.
 
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