don't bother with the cpr. They are high maintance. Great when they work though. Basically the nipple where it sucks air out can get clogged with algae growth or clogged from debris. When this happens air can get cought and build up. When that happens it will stop working and one day you'll find a big fat mess at home with water every where! Your better off drilling holes in your tank. Trust me I learned from experience. But if you must have one they are nice when they work.
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