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Message: <blockquote data-quote="minus9" data-source="post: 10655511" data-attributes="member: 78661">The height of the water level in the external box is determined by a couple things. Gate valve, stand pipe height in relation to the primary and secondary siphon and turnover/flow amount. First you need to determine what turnover rate you're going to use, then you'll need a couple different length PVC pipes to play around with, along with adjusting the gate valve. It will take some time experimenting with the PVC pieces in order to get the right combo for your tank/setup. My reasoning for utilizing a lower turnover rate is very simple. First, the flow in the display should come from powerheads/pumps and not the return (which is a complete waste of energy and shortens the return pump's life running at full tilt). Powerheads/controllable pumps are designed for flow, return pumps are not, unless they are utilized in a closed-loop. Second, the lower turnover allows for detritus to be kicked up by the powerheads/pumps in the display and brought down to the sump where it can settle and be easily removed. The return pump is there to exchange water from the sump to the display in order to heat, provide oxygen from the skimmer and allow the skimmer to actually pull out the crap we're trying to get rid of, plus there should be enough flow from chamber to chamber to catch anything with mechanical filtration.But hey, there's a million ways of doing this, I just like to keep it simple.</blockquote>

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