Hi!
I've googled this and it seems that the chlorine (calcium hypochlorite) is oxidizing the copper in the water, turning it green. The only suggestions I've come across is to use metal remover to remove the copper, but I've added copper sulphate to keep the algae under control (works amazingly well), so I don't want to take it out surely?
pH and total alkalinity are within normal ranges. It usually goes back to blue after a day or two but it's pretty annoying.
What else can I do to try prevent this?
Some background:
I switched from using boat loads of chlorine (both stabilised and non stabilised) and non metal algaecide (didethyl dimethyl, ammonium chloride) to a "hassle free" product consisting of a once a month "booster" (copper sulphate and zinc sulphate (I think the zinc acts as a clarifier?)), and 4 packs of calcium hypochlorite - one a week.
This was working considerably better than the previous solution and costing much less too, but then it started going green after adding the chlorine, a few months in.
I've always avoided metal based pool products because you often read that they can stain your pool, but so far no staining.
The product is designed for a 50000l pool, and ours is around 70000l, so I'm doubtful that I've put in too much copper sulphate, although it's possible.
I've googled this and it seems that the chlorine (calcium hypochlorite) is oxidizing the copper in the water, turning it green. The only suggestions I've come across is to use metal remover to remove the copper, but I've added copper sulphate to keep the algae under control (works amazingly well), so I don't want to take it out surely?
pH and total alkalinity are within normal ranges. It usually goes back to blue after a day or two but it's pretty annoying.
What else can I do to try prevent this?
Some background:
I switched from using boat loads of chlorine (both stabilised and non stabilised) and non metal algaecide (didethyl dimethyl, ammonium chloride) to a "hassle free" product consisting of a once a month "booster" (copper sulphate and zinc sulphate (I think the zinc acts as a clarifier?)), and 4 packs of calcium hypochlorite - one a week.
This was working considerably better than the previous solution and costing much less too, but then it started going green after adding the chlorine, a few months in.
I've always avoided metal based pool products because you often read that they can stain your pool, but so far no staining.
The product is designed for a 50000l pool, and ours is around 70000l, so I'm doubtful that I've put in too much copper sulphate, although it's possible.