Haywards Off-line Chlorinator can be installed on pvc plumbing returning to the pool. It is free standing and only requires holes to be drilled to be installed. It is connected with 1/4" flexible tubing and attaches to pipes with compression fittings. It can hold up to 9lbs. of 3 inch tablets, 1 inch tablets or chlorine sticks. Adjustable output knob for setting the correct level to maintain your chlorine readings.