Cheapest Phosphate Test Kit?

Curiosity101

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As above, what is the cheapest reliable phosphate test kit. Chances are I'll only be testing for phostphates once every couple of months as I'm testing on a freshwater tank. On the odd occasion we have spikes in our tap water supply and I dose TPN+

So it would help me to be able to keep an eye on phosphates, but I wont be using alot, and I don't want an expensive kit expiring.
 

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