There are different types of Phosphate (organic/inorganic) that require different tests to detect, but I think Phosphate tests are a waste. Just look at your tank. If you have hair algae you can be assured you have a Phosphate problem regardless if what the tests say.
You can get a complete reactor rig with everything you need, including media for less than $100 dollars. The cheapest protein skimmers around are still more than that.
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