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In ground pool with 11 year old filter and sand. Last summer I noticed this problem while vacuuming after shocking pool for visible algae. This spring I am late on opening pool and it is very green. I normally super shock it and vacuum up the grey algae lining the pool bottom the day after...

I have read a lot of information on the Internet about using air compressors or shop vacs to blowout in-ground pool lines instead of paying the ridiculous prices of the Cyclone/Big Blue blowers (why are there not more brands and models available??). Apparently the compressors and vacs may have...