Alternative to stock Mastercraft Ballst Pump

Does anyone know of an alternative to a stock Mastercraft internal ballast pump? They don't do a very good job of draining. Thanks for the help.

Id be interested in this as well. My pumps have been terrible since day 1. Never fill or wont empty or one fills the others dont. Kinda gave up and use fat sacks but would love to use the ballast that i paid for

i think its more design then the pumps. Hard tanks just don't drain welll with the impeller style pumps. Thread a 3/4 inch bilge style pump on one of the lower ports, would work for emptying, might need a check valve too? Use the stock for filling only, they don't really like switching directions much anyway.