Straining is one of the processes taking place during filtration and is perhaps, the one most pool operators will be familiar with. The process involves dirty water passing through the filter media (usually sand) and particles of pollution becoming trapped in the small gaps (pores) between the grains of sand because they are too large to pass through.Take a look at the picture (click to enlarge). In swimming pool filters, the size of the sand grains is usually 0.5 - 1.0mm. This results in a p... Continue reading ...
