Expanded clay pellets Fiberglass They feature built-in thermal overload

They feature built-in thermal overload protection

They are fitted with a friction fit ring

This is one of the highest quality refractometers we have found on the market

which allows the cartridge to be changed without interrupting the flow

The medium pore in these airstone maximizes low maintenance and high oxygen transfer

Expanded clay pellets Fiberglass They feature built-in thermal overloadThis light weight clay aggregate is an excellent growing medium for any hydroponic system and pond plants. Clay aggregates are heated at 1,200C, creating an inner pore structure and ceramic shell that holds moisture for roots and helps minimize the buildup of salts and nutrients. The aggregate wicks the water and nutrient solution upward, pebble by pebble, releasing it to the plant roots as needed. The round shaped structure provides excellent root