I have heard others using those type pumps recomend an over pressure relief valve to protect the pump. The places that sell the pumps usually offer them.
I would get rid of the stone and go to a 9" disk membrane diffuser.
The way to control pressure is install a "y" with a valve and bleed off any extra air you do not need at the time.
I have thought of using air tanks, but not for the purpose you state. If a person had a fairly large tank you could run the air through the tank first. This would allow the air to cool and condensation drop out into the tank (drain valve on bottom to get rid of moisture) before entering the lines to the diffusers. This MIGHT help prevent winter air line freeze up. I've not done this so it is just a theory.
Last edited by snrub; 02/02/17 07:47 PM.
