Crystal Pool (PVT) Ltd. Sangabo Mawatha, Anuradhapura 0716552500 crystalpool.lk Sand filters are cleaned by backwashing, which will involve reversing the h2o move throughout the filter, and flushing the soiled drinking water right into a squander line. Notice that it’s vital that you exam the pool drinking water in advance https://maps.google.com/maps?ll=8.310069,80.40174&z=16&t=m&hl=en&gl=LK&mapclient=embed&cid=3232803549851328223