Couple the chiller with a temperature controller, and you can keep extremely stable temperatures (mine generally don't fluctuate more than. More stable tank temperatures reduce stress on fish and to a greater extent corals. The guy's from England and I must admit what he says make sense.You're right, chillers are definitely expensive, and I wouldn't rush into getting one, but here are the big benefits as I see them: and there must be no breaks in the flow/loop. The only thing to remember is that the water source/feed must be the same height as the return/output end. This is exactly what is happening in a closed loop, whereby the weight of water coming 'down' to the pump, equals the weight of water being pushed upwards back to your tank. now if I was to put 50kg on your end of the see-saw as well, then you would find that it was very easy to make the see-saw move'. ![]() height, the heavier the load will be, and the harder the pump has to work to shift it. ![]() This is what your pump feels when it is trying to pump a 'weight' of water up to your tank, the more water there is i.e. 'If I was to place a 50kg weight on one end, and then I asked you to push down on your end, you would feel a given amount of resistance. One easy way to understand the 'no head loss' principle when we talk about closed loops is to look at a see- saw. In this case we can use a single pump to deliver high volumes of flow through a number of outlets without any major loss of flow which would be inherent if we were to break the siphon effect by passing the out flowing water through a sump. the benefits are that there is effectively no head pressure to overcome as the weight/pressure of water flowing down the outlet is equal to the weight of water flowing back up under pressure. This is where we take water out of the tank and feed it through a pump situated below/above or level with the tank and then strait back to the tank again with the aim of increasing circulation without the unsightliness of powerheads. Anyway, here's what's written on the webpage for those of you who doesn't want to go there: Closed loops. One more thing: Should there be any head loss on a close loop? I read on this website ( ) that their shouldn't be any because the siphon effect is not broken in a close loop. However, the SCWDs for my setup only need to push the water from back to front (2 ft.) of the tank. The 3/4 inch pipes running left and right of the SCWD will travel horizontally about 6 inches on each side, then turn 90 degrees via 2 elbows to go strait up for about another 6 inches, through another 90 degree elbow that is connected to the tank bulkhead.Īfter reading many posts about the SCWD, I'm beginning to wonder if the SCWD may be too small for my setup. ![]() Each pump will return the water via a 3/4 inch pipe and connected to a SCWD about 3 feet up. The water will flow from the middle of the tank down 2 1-inch pipes to 2 Eheim 1262 pumps (900GPH/12 ft.). I have 6 holes drilled on the back of the tank for this purpose: 2 1 inch holes a foot apart in the middle and halfway up the tank for overflow 4 3/4 inch holes spread evenly across the length of the tank and 4 inches up from the bottom are the returns. I bought 2 SCWDs and intend to use them on 2 closed loops on my 165g (5.5x2x2).
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