The photograph provided by Bill appears to be at the water line of the pool (which has been emptied/), If this is true, and if this is a public pool or a private pool used on a daily basis, the these deposits arise from splashed water evaporating - in the hot summer days, before the water film runs off entirely. The deposits are of calcium carbonate - and the water is probably hardened to well over 250mg/l (to comply with the Langelier saturation Index (LSI) requirements) The carbonates in the water are supported by leaching of Calcium salts from the cream coloured plaster shown below the ceramic tiles.
Sustained repetitive acid washing will remove it but the best idea is to tackle this phenomenon as it appears and not let the deposits build up. The thicker the deposits the longer it takes to remove and this of course causes more damage to the surface.
After such a treatment - and while the pool is still empty - it is advisable to apply a couple of coats of transparent epoxy sealer.
Further to this adding a long chained polymer clarifier will help keep the calcium in solution - that is it will tend to want to run off the vertical tiles and leave less of film which can evaporate fast enough to leave deposits on the surface.
Usually these deposit appear only above the water line. SO if this is the case - - by simply raising the water line for an extended time by simply plugging off any overflow exits and filling the pool to full capacity.... over time the Calcium will dissolve back into the water. This comment only applies if the photograph is inded on vertical tiles at the water line.
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Comments
Sustained repetitive acid washing will remove it but the best idea is to tackle this phenomenon as it appears and not let the deposits build up. The thicker the deposits the longer it takes to remove and this of course causes more damage to the surface.
After such a treatment - and while the pool is still empty - it is advisable to apply a couple of coats of transparent epoxy sealer.
Further to this adding a long chained polymer clarifier will help keep the calcium in solution - that is it will tend to want to run off the vertical tiles and leave less of film which can evaporate fast enough to leave deposits on the surface.
Usually these deposit appear only above the water line. SO if this is the case - - by simply raising the water line for an extended time by simply plugging off any overflow exits and filling the pool to full capacity.... over time the Calcium will dissolve back into the water. This comment only applies if the photograph is inded on vertical tiles at the water line.
Alan Lewis
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Thanks,
Justin Gregoli