This was my experience. I just use the phenol red and comparator block.
No. Phosphates are generally irrelevant. Stay out of Leslie's. Your test kit is the gold standard. We don't recommend phosphate removers. It is just a way to sell you something you don't need.
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Which should I buy? TFP's recommended pool chemicals are cheap, easy, and won't unbalance your pool water.
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These pool chemicals should not be added to your pool. Save your money and frustration and avoid these chemicals!
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Add drops until the color does not change again. Subtract the last drop.
Pucks add CYA and are not sustainable. Use liquid chlorine or get a salt water chlorine generator.
CONGRATS ON THE KIT!!!