Plus they're as quiet as your return pump, they don't make noise. Not for everyone, but i like them & will continue to use. This is true (with all mechanical componants in the water) and is good to know, however a good maintenance plan will make it last longer. also, will fail over time, the internal components will be caked with calcium deposits etc and wont turn anymore. Also, plan on an oversized pump, one drawback is that you lose about 40% output with the SCWD & that's before I reduce down to 1/2". you would want to use an over sized pump with the scwd. It will be powered by either 150watt or 175watt MH with T5actinics.I plan 600. heres the concept with a SCWD wavemaker the long thing on the left side is a snake locline that will come in through my rock work. Other than that they work really well & keep extra powerheads out of my display. in the concept stage right now but I have the 2 tanks,a dremil and a glass cutter ready. I also run 1/2" returns & just use reducers as close to rhe return nozzle as i can get, usually a foot or so. Also the 1" gets pretty poor reviews since they changed it so that you can break it down to clean it. A couple things that I've noticed.they need to be cleaned about every 6-8 months, which for me entails soaking in vinegar for about an hour while i do a water change/tank maitenance, then a good rinse. I bought a backup in case I needed to swap out a few years ago & it's still new & will be using it on my new tank & keeping the original as a backup. You have to have 2 returns to alternate the flow, but other than that mine has been going strong. MSRP 59. What is SCWD Our SCWD (switching current water director) wave makers are used in fish tanks to repl SCWD Wave Maker. 've been using SCWD's for random flow for 6+ years & am still using my original (used) one. Only 4 1/2 X 5 inches, and hermetically sealed, SCWD can be mounted externally or internally and requires no additional energy, according to the manufacturer. Never tried it myself, but the amount of time it's been around must mean something. It would be nice to remove some powerheads.This product has been in the aquarium trade since I started in it almost 20 years ago. I'd like to see what type of flow that puts out on each side of my tank as it cycles. That system uses a Mag 5, which pushed 300gph at 5 feet of head pressure. What size tank are you going to use them on? I'm trying to figure out what would be good for my 29gal right now. I'd also like to know if it has a built in checkvalve to keep the water primed, or if it drains back out of the unit and down to the pump/sump again. That is fine the first time, but what if you turn off your sump once a day, as part of your feeding routine? I'd like to know how the unit would do in those circustances. It looks like they suggest starting it up with 1/2 the flow of water going to it, then opening the valve 100%. I was trying to read the instructions that are listed on the mfg's site, but it is really hard to see. I'm going to order one as well, from a source that should back up the product if I run into problems for some reason. I'm a little leary of that guy that's offering them on RC, since he's got no obvious history (4 posts total!), with a mostly empty profile. 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.
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