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Adding algaecide to the pool when the filter is on should not do any harm in fact it should mix it into the water more quickly
Chlorine and Algaecide, and flocculate then when the algae is dead vacuum it to waste from the bottom of the pool. ( Follow the instructions on the containers)
Most 50% algaecides if added properly according to gallons of water in your pool allow you to swim immediatly after adding.
shock it, then 24 hours later brush and vacuum. if still murky, algaecide, maximum dose on bottle.
A person can make a homemade pool algaecide by combining bleach, baking soda, and Borax. This shocks the pool and increases the pH if needed.
Algae spores float around in the air and can hit your pool at any time You can fix it by 1 shocking the pool and scrubbing the walls and floor of the pool if this doesn't clear it up just get an algaecide from your pool shop. When you vacuum the dead algae out of the pool it would be a good idea to vacuum it to waste to reduce the risk of reinfecting the pool.
I suggest you contact the manufacturer of the algaecide and find out from them what would be the bes coarse of action.
By killing the green algae with an algaecide available at your pool shop.
Suppose you could but who would want to. You possibly have added too much algaecide. Have a dirty filter. Have poor chemistry - out of balance chemically. Too many people in pool. Lack of proper filtration.
Days to weeks depending upon how much algaecide you added without reading the instructions first.
my pool did get milky but cleared up after 48 hours
Use an algaecide and test for phosphates.