Membrane diffusers are a great alternative to airstones in many aeration applications. Membranes have hundreds of "I" slots that open as air pressure builds inside of the diameter. The center of the membrane does not have slots and acts as a check valve when air flow stops. Diffusers have a 3/4" male thread inlet and are 10.5 inch diameter.
Filters that have not had water circulating through them for the winter should be cleaned well before turning the pump back on this spring. Cleaning will remove toxins that can develop from waste breaking down in the filter in the absence of oxygen. Once your filter is up and running, seed it with beneficial bacteria.
