Who has used them ? It seems pretty simple to me but Im not so sure I could get away with having just that . I think I have 2 holes drilled in bottom of tank ( I haven't actually seen the tank in person yet ) and since its a 210 I calculate I will need roughly 8000 gallons per hour to turn tank over 40 times . Thats a pool pump lol with 2 inch outlet running around 30 PSI or so with only 3 ways to introduce water to tank Im not so sure about it . so anyoe with some experience with this please chime in and give me some thoughts / advice please