6" Air Stone w/ 1/2" MNPT Basins Each unit has a heavy

Each unit has a heavy duty PVC Check Valve with a MNPT fitting that screws into the pump on one end

No water restrictions associated with the use of this product

Do not use regular Table Salt as a couple of the ingredients can be toxic to fish

Sixteen stainless screws securely attach liner ring to base with water tight seal

but generally 2-3oz per gallon of spray mix is adequate

6" Air Stone w/ 1/2" MNPT Basins Each unit has a heavyThis high quality, fine bubble diffuser is constructed of an Alumina product, which is 3 times stronger than glass bonded silca air stones. It has a 1 2" male pipe thread connection and a recommended airflow of 0. 50 CFM.