How high part per billion (PPB) do these strips test up to?

0-2500 PPB is the test range for these strips. The recommended phosphate level should be as close to 0 as possible and at least below 500.

If using phosfree product in pool is this the only water test strip you need or do I need further water testing?

You should always test more than phosphates (chlorine, ph, alkalinity, etc), but this is the only product you need to test for phosphates and personally I think best one on market!

How long should you wait between inversions?

No waiting—just invert slowly 5 times

Why is it "prime" when the order takes weeks to arrive!? I cancelled due to this issue.

Shipping may be "Prime", once the order is filled - perhaps they were out of stock and had to locate supply

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Natural Chemistry 00080 Phosphate Test Kit N/C

Product ID: 78212402

88863CFA

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Description

Phosphate Test Kit N/C Manufactured to the highest standards to provide you with a quality product Best value for your money

The Natural Chemistry Phosphate Test Kit N/C is designed to last. It is made from quality materials and has been tested in a rigorous quality control processFeatures:Manufactured to the highest standards to provide you with a quality productBest value for your moneyPhosphate Test Kit N/C

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