Swamp Cooler Algae

At just about any store that sells swamp cooler parts, you should find "algae blocks". I can think of one called the Fresh Air Block. These are simply placed in the pan, under the inlet water flow, and allowed to disolve. You might have to check on them monthly depending on your cooler usage.

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Larry Galpin The Cooler Doctor

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also set up a bleed hose that a small amount of the water that is pumped to the pads is dumped out ...use it for the lawn or whatever....this keeps the water from building up a large concentration of minerals and other junk....

Mark