Hi!
Your pool guy is full of it. He just wants to sell you expensive phosphate remover, regularly.
Ditching the N2 is a good idea.
You need to spend $50-$80 on a good test kit. We recommend the Taylor Technologies K-2006 or K-2006C. You can get the best price by clicking on the link in either WaterMom's or PoolDoc's signature.
Gotta run. More later.
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