Low Pressure Air Stones Monitor They have a stainless steel

They have a stainless steel 41/2” weighing surface

Robust Aire increases efficiency with respect to oxygen transfer as the water deepens

frost heave or collapse

Our venturi fittings were engineered to entrain the greatest amount of air with the least resistance to water pressure

Pond Logs requires flowing water to work so locate it in a waterfall box

Low Pressure Air Stones Monitor They have a stainless steelThese airstones are housed in a plastic body to help protect the airstone and give a cleaner look. These airstones work well at low pressures and are ideal for backyard and koi ponds. As they also blend in will to your pond as the black body matches most lined and moulded ponds. The medium pore in these airstone maximizes low maintenance and high oxygen transfer. These 8 diameter air stones have a 3 8 barb.