Why chlorine disappears overnight: the phosphate factor

Name: Rivera Pool Care
Address: Murrieta, CA, US
Telephone: (951) 383-9753
Price range: $$

When chlorine drops to zero even though the pool looks clear, invisible phosphate load may be feeding microscopic algae faster than your sanitizer can keep up.

What pool owners should know

Fertilizer drift, windblown soil, and landscape runoff introduce phosphate nutrients into the pool water.
At high levels, algae reproduce continuously. Basic test strips do not measure phosphate; a specialized test is required.
Professional phosphate removers bind the nutrient into a precipitate that the filter captures (causing temporary cloudiness).
A complete filter cleaning is needed a few days after treatment to clear the heavily loaded filter media.

Rivera Pool Care takeaway: Repeatedly adding chlorine treats the symptom. We test phosphate when the water repeatedly loses sanitizer to address the root cause.