Is it true that fibers from clothing can clog pool filters?
It would take a large piece of fabric to clog a pool filter. Sand and cartridge filters filter particles down to 40 microns and DE filter filter down to 5-8 microns. All filters are designed to filter out particles, tiny fibers of cloth included. The cloth fibers will not make the filter clog any faster than any other types of debris.
I disagree. The accumulation of dust, dirt bugs, small particles, hair, cosmetics, underarm deodorant and lint that get past the pump basket can and will clog the filter. When the pressure goes up, say 5 to 8 pounds above normal or clean pressure then it is time to back wash. Now, many filters vary on this rule. Some cartridge filters may in fact loose pressure when dirty. There are some systems that just do not change pressure noticeably when dirty. Every or most systems will vary some. BTW, backwashing does not remove all of the D E , dirt, hair, lint etc. There is always some left in the filter no matter how long you or how often you back wash.