What many GPM (gallons per minute) should I be looking for when purchasing a water pump? I have a 300 gallon fresh water tank and a prochem 405
300 gal fresh water tank? That some serious storage capacity. As far as your gpm, I guess that depends on your TM pump. I believe you have a Cat pump? I am sure somebody knows the answer. I do have a demand pump, the gravity fed just does't cut it for me. spotman