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Originally Posted by Coues
You can get some chemicals at homedepot that will resolve the mineral build up in your water distributor.
If you don't have your cooler set up on a bleed system, the pipes and pads will get packed with minerals very fast. You should be bleeding a small portion of the water in the sump off constantly to keep from minerals from building up in the water distribution system and evap pads.
I worked at a evap cooler mfg for 12 years and failure to set up your bleed off correctly was the #1 cause of problems.
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Mine doesn't have a bleed off system that I know of...
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I recently replaced my evaporative cooler after 9 years, and had a constant problem with mineral build-up. I never tried using the bleed system on my first cooler. This was my biggest mistake. The bleed system on my consists of a plastic tee (located between the water pump and the spider arm) with a tiny port designed to accept a super thin hose. While water is being pumped to the spider, a percentage of water is constantly being directed into the smaller hose, where I sent it out of the swamp cooler, and into my bathroom air vent.