green water

[bruce williams]

i have put about 20 lbs of granular shock into my pool, that is about 20,000 gallons, the ph and alkalinity are good but the cyanuricis very low. what do i do to get the green out?

[Pool Helper]

Add cyanuric acid to get the level to at least 30ppm. Measure free chlorine and keep it above 3ppm until the green tinge turn to a pale cloudy green, after which the pool will start to clear.

Run the pump round the clock, vacuum and backwash frequently.