Phosphate Testing

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stanleo

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I got a new API Phosphate test kit today because I didn't trust my old one and got some very interesting results.
 
tap water: 0.5ppm
 
r/o water: 0ppm
 
newly mixed saltwater made with r/o water:0.25ppm
 
water in SW tank: 0.25ppm
 
water in FW tank: 0.5ppm
 
new water for FW tank made with 1/2 dechlorinated tap water and 1/2 r/o water 0.25ppm
 
I use Instant Ocean Reef Crystals for the salt and I am not reading anything on the bag that it adds phosphate to the water so I am at a loss as to why it has phosphate in the newly mixed saltwater. Can anyone help me on that?
 
Is that the reason for the algae growth or is it low enough
 
I have a thread going in the Marine chit chat about the SW tank and there are pics and a lot more info if you need it. The thread is called My New Saltwater Tank!
 

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