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We have a villa we manage with a Desjoyaux pool.

The water has gone green & STAYED green despite best attempts. High levels of Chlorine, three quarters emptying & refilling, hydrogen peroxide, shock treatment. Nothing has worked does anyone out there have any idea what we can do?
We now have renters in who obviously want to use the pool & it's green so not very attractive!
HELP

caroline postlethwaite wrote:We have a villa we manage with a Desjoyaux pool.

The water has gone green & STAYED green despite best attempts. High levels of Chlorine, three quarters emptying & refilling, hydrogen peroxide, shock treatment. Nothing has worked does anyone out there have any idea what we can do?
We now have renters in who obviously want to use the pool & it's green so not very attractive!
HELP

Algae get killed by high levels of chlorine, generally a shock treatment will release chlorine quickly so you can seriously raise your chlorine level without long term, adverse effects.

Dead algae are still green and need to be filtered out - if they are microscopic they can go straight through your flter so use a floculant - this will congeal them into bigger particles that can be filtered.

Add an algaecide to stop them coming back.

Check that the PH is OK first. Then add algicide to kill the algae. The next day add flocculent to precipitate out the dead algae. The next day you can clean it off the bottom.

Multifunction tablets will keep it clear thereafter better than "chlor lent".

Russell.

hi, friend of mine had the same problem last year , they took a sample of the water to a shop in alenya who specialises in swimming pools and were advised to empty the pool completely , clean it and then fill it back up. They followed their advice as they had already wasted nearly a month trying various products.

tia wrote:hi, friend of mine had the same problem last year , they took a sample of the water to a shop in alenya who specialises in swimming pools and were advised to empty the pool completely , clean it and then fill it back up. They followed their advice as they had already wasted nearly a month trying various products.

A very drastic and expensive solution, unless you have a forage. At about 3 euro/m^3 for the water, that works out at about 150 Euro for an average sized pool. Hard work as well, how are you going to clean it? There will also be algae trapped in the filter which will start to multiply again unless it is properly treated.

There may have been other reasons for the shop suggesting this, such as a high level of hardness in the water which can build up with time as water evaporates and is replenished.

I would try other solutions first.

Russell.

Thank you everyone. Hydrogen peroxide looks like it's done the job. Thank goodness it's blue again!!