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Message: [QUOTE="mgeez, post: 61549, member: 2674"] I have no choice but to use a weir with my setup. I cleaned the 250# lava rock on Monday, what a job and mess! I am going to use my 3 cu ft of pvc shavings and add another 2 cu ft when I build my new filter. If I ever need to clean it, I can just open up may arms wide and lift the entire 5 cu ft out and power wash it. I assume i will have to do this every late fall, since everything freezes up in Pa. It is my understanding that the beneficial bacteria dies off in cold climates. I do have an unheated greenhouse where i put all my water plants in to overwinter. I have a makeshift pond in there that never freezes over. Maybe someone can "chime in" if they know what water temp the good bacteria can withstand. I am 100% uneducated when it come to things like this! Mark [/QUOTE]