Kurt Ullman writes:

Any way to chemically or other wise leach
out the phosphates?

Be skeptical of pool store tests, especially when the infallible computer
tells you to buy a bunch of stuff.

Dose 10 ppm free chlorine in the evening and lower pH to 7.0. Cures just
about anything that can outgas from the water.

Pool stores look like pharmacies any more. They have bottles of high-
priced remedies for every possible ailment, when you hardly ever need
anything but the most ordinary chemistry.