Water Fountain: How often should I clean it?
I have one of those "Drinkwell" water fountains for my two cats. The
water passes through a fiberglass/charcoal filter, then out a spout
into a dish, and is then recirculated. I have to add about quart of
water every three days.
Question: How long can I go without changing the water and the filter
and cleaning the unit?
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