We gotta design ourselves a 1 way nozzle for the ends of my 2 return. something with overlaping flaps on the inside that are pushed open by the water flow. i like your swapping check valve idea but a quick question how do remove the checkvalve? my ball valve cut off is after the check valve. i could go check valve, check valve and the second check valve could be the one i swap out.... and if the permanent one gets loaded with crud so be it check valve 2 the rotational clean one will be up to the task.... i hope
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130g peninsula aquarium
45g sump
Tek light 8 bulb fixture, tunze nano wave box, vortech mp-20, rowaspas reactor, carbon, hydor preformer 600 skimmer, quiet one 6000 return
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