very similar,That may be a 10 psi pump and the lower the running pressure the longer it will last.If your two discs are rated .5 cfm you have too much pump and will need to bypass some air or add diffusers.Look for a cfm range from the diffuser manufacturer.If they are rated to 2 cfm each you may be OK as long as they dont cause the back pressure to exceed the suggested top end from Gast.If you put it 300 ft away I would use an ID of at least 1 inch (bigger even better)or two lines works well too. If you mount it pondside use no less than .5 inch lines to each diffuser.You might air it up out of the water to see how much back pressure you have and then figure adding .5 psi to that reading for every foot of water depth the diffusers are in.Try to match everything up to have the lowest back pressure possible for the longest system life.