How long does Hydrogen Peroxide last in a pool.

[Richard Coomer]

I have a 90,000 liter pool and I used 10L of 50% Hydrogen Peroxide once before, a good many years ago in the early spring. This cleaned all algae problems and stains out at once. I left the pool without any chlorine addition until the water started turning green again, (about 4 weeks). When I started adding Chlorine, it would not stay in the water for even one night and the water stayed green until I threw in about 4 kg of dry chlorine.

This spring I have added the same amount of Peroxide. My question is, How long should it take for the sun to decompose the Peroxide?

 

[Griswald]

Hydrogen peroxide has a half life of 5 to 10 hours, so half of what you put in is gone in 5 to 10 hours, down to 1/4 of what you put in within one day. After that, it's practically done by the middle of the next day.