I've heard the good and the bad about these things, but I'll tell you about what I've dealt with using a CPR50
They Work. However, you do need to watch the siphon which on my model tended to clog with crap every once in a while and the overflow would lose siphon and well, you know what happens after that.
I've since stopped using my CPR50 because I won't be able to tend to the siphon every day. I guess what I'm saying is if you don't have the time to genuinely watch it every day, don't use it.
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"what do you mean you need another tank??"
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