Crystal Pool (PVT) Ltd. Sangabo Mawatha, Anuradhapura 0716552500 crystalpool.lk Sand filters are cleaned by backwashing, which consists of reversing the drinking water move through the filter, and flushing the soiled h2o into a squander line. Most periods, achieved players choose to position balls in close proximity to their pocket https://listedirectory.com/listings311953/sri-lanka-swimming-pool-builders-things-to-know-before-you-buy