Pondmaster 1000/2000 filters are what they are, a very inexpensive submersible mechanical/chemical filter media tray which attaches to the suction side of a submersible pump. Cleaning the filter means disturbing the tank by removing the filter tray from the tank bottom, which may not mean much in a stock tank application. Biological filtration is essentially non-existant based simply on the available filter space. The 500gph rating of the Pondmaster 1000 is pretty anemic for a 150 gal tank as well. Between the cost of the Pondmaster 1000 and a mag 7 pump you're over $100 in cost too. Going with a Pondmaster 2000 and a mag 12 pump, which better matches your tank size, is knocking on $200. For that kind of money you could go with two Rena XP3's or similar canister filters, with a more or less adequate total flow rate vs your 150 gal tank and much better filtration possibilities.