Dead algae and other rotting materials will turn grey and slimy inside a filter. Chemically clean the filter and then watch to see if it reappears. Chances are your filter cleaning interval is too long giving the detritus time to break down and rot. increase the number of cleanings per season to avoid funk. Pool & Spa
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A pool filter is there to remove particles of foreign matter from the pools water. Without a filter to remove this material it would not take long for the pools water to become cloudy and dangerous to the health of the swimmers.
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chlorine or the filter
You can go to the city you are interested in and check for pool permits. And other searches can filter out number of addresses that may have pools.
They have big ears and gray fur. The ears help to filter heat. The fur is usually gray. They live in mountains, which are also gray.
no some use bromine, and others filter the water through an activated charcoal filter, and even now some use a high-grade salt and low-grade chlorine-bromine mix as a filter.
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Most home pools use a cartridge type filter. These are quite adequate and filter down to the 25 micron range. If you have health concerns, you should consider a diatomaceous earth filter, which can filter out particles in the size range of most bacteria and many virus cells. This is the type of filter used on most commercial swimming pools.
Some whales use filter feeders.
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