Back to the original posting.......
Stains on our liner are usually caused by lizards and even frogs that get into the pool during the winter, sadly fail to get out again, and their decomposing bodies leave a lizard or even frog shaped outline on the liner. Usually vanishes without effort on my part bt the end of the season...
We purchased a self adhesive freeze from a company in UK with great results. It can be ordered in quite a few designs - we chose a mosaic effect to hide any stains that may occur. It is 9 inches deep and comes in various packs and additional 2 foot lengths. We installed it before the beginning of this season and are delighted with the results. Although our guests are still using sun tan lotion and staining the freeze, it is not noticeable because of the mosaic design. It cost under £200 to do a 10 X 5 metre pool and was relatively easy to do . Only draw back, they do not deliver to France. PM us for details. We have no association with this company but are gite owners with the same problem as many others.
Joined on 28/07/2008
London and 37 Guerchois
Posts 3,731
Re: stains on liner
I am in favour of re-introducing the victorian bathing costume for people who insist they may catch cancer whilst swimming. After 3 days of scrubbing waterlines, in some cases it was so thick it could be removed by a fingernail.
Some more help from our tame polymer chemist Buckendave would be useful.
The problem is that the liners are made from plasticised PVC, i.e. PVC polymer with a compatible oily liquid that makes it soft and pliable, but is not easily extracted. The plasticiser is compatible with the oil in suncream, and that has colourants added to it. So, as oil floats on water there is a concentration at the water line. Once its migrated into the PVC there is no way its all coming out. All I can think of, to minimise the consequences, is to lower the water level and carefully clean around the stain line with a mild detergent, then rinse off with clean water - all the time keeping any detergent out of the pool. I have a GRP pool and get the same orange brown line, but so far it has always cleaned off.
However I have my problems too - earlier this year I moved the pool pump, filter, etc., from a horrible box in the ground into a pool house and had to cut the pipes so I could extend them. All OK except sealing off the pool return - in the end I covered the cap in the pool with some thick PVC and held in place with a stainless steel jubilee clip. Marvellous, it worked a treat, no leaks. But a couple of months later when all the pool pump works, etc. were done, I removed the pool cover to remove the PVC and jubilee clip and found a brown iron stain up the side of the pool - not all the stainless clip was what it was supposed to be (not that stainless is completely anyway). But how to get rid of the brown stain? A lot of gentle rubbing with plastic pan scourers (using my feet!) has reduced it hugely, but what I'd really like to do is try a mild solution of oxalic acid on it - can't drain the pool though and don't want to risk contaminating the water, so I'll live with it.