Ways to avoid airlocking your siphon: make sure the line fully drains when powered off, end the line above the surface of. All brought to you via a wandering mix of projects, articles, reviews, tools and random snippets. If you omit the downturned elbows as described in Bean-an-animals original write-up, airlocking your siphon line is less likely and leads to a shorter startup time and less overfill of the tank before the siphon kicks in. The downside is that you would have to drill the back panel of the tank for two relatively large bulkheads that connect the inner and the outer box. This is what you go by not the pumps rated flow which is generally at 0 head height. Home of the 'Bean Animal Silent and Fail-Safe Overflow System' and many more interesting things reef aquarium, engineering, electronics and even food related. They generally come with a third overflow which is used as an emergency overflow (called a Bean Animal for its creator). Remember when looking at pump flow you have flow loss according to height the water has to be pumped (head height) many pumps have charts that give flow at different head heights. Couldn’t afford line lock ends that would have been much easier. The tank side of the inlet bulkheads will. The three 1 1/2 inch standpipes form the Bean Animal overflow while there are two 3/4 inlets splitting into a total of four 1/2 inch bulkheads. The overflow is 55 centimeters deep while the outer tank has 60 centimeter high panels. This didn’t work as well as intended as after a while it was rather hard to turn them. The tank is 1.5 meters square with the overflow 50 centimeters square. I also built a manifold with 6 pipes running into the tank that could be pointed to adjust flow pattern. So it is likely just pulling too much so the siphon continually starts and stops, so you just need to close the valve until the siphon engages, then slowly dial it in to adjust your overflow level. It suggested for maximum flow to use a 1.5 inch return pipe. Okay, so a 1' pipe with a at least a two foot drop (with a full siphon) will pull quite a bit more than 600 GPH. Lava is okay, but per unit area, the sponge does a good job. At least you get decent large scale mech filtration this way. The downtuned overflow pies can still be done with a sponge prefilter, but you can use the mech filtration in the sump instead, eg, block sponge 20 ppi. I have been using a Danner Mag 7.5 for around 5 years there are many pumps better including adjustable flow DC pumps. Most of the FYIs are based on experience. Many people don’t want more flow than what their skimmer is rated for. ![]() The size return pump will depend on how much flow you want through the sump. You can get the flow where you want it by using power heads/wave makers or a gyre generator.
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