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Old 01-06-2005, 01:32 PM   #1
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SCWD

does anyone know if a SCWD has a built in check valve? just curious. i was going to install one from my return pump ( which will be the input to the SCWD ) but i thought SCWD's might only work in one direction like a check valve

steve r
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Old 01-06-2005, 01:40 PM   #2
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I think they do only work in one direction....I belive they are intended to be installed on the return pump line.

here's the link: http://www.drsfostersmith.com/produc...1&N=2004&Nty=1
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Old 01-06-2005, 02:27 PM   #3
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they will back flow through if the pump stops.
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Old 01-06-2005, 06:11 PM   #4
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thanks
steve r
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75g RR. 2x250 14k MH / 2x54 T5 act. 29g sump. ASM G1X skimmer. phosban reactor. 80lbs LS, 90lbs LR, 2x seio M620.
kole tang, bicolor angel, mandarin dragonette, ocellaris clown / BTA , cleaner shrimp, 2x peppermint shrimp, a variety of soft, SPS, and LPS corals, orange linckia star.
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Old 01-06-2005, 09:02 PM   #5
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yes, if the return pump loses power it will start a siphon. I found this out the hard way and had a mini pool in my room. Would be kinda cool if they manufacture it a different way so this doesn't happen. I know a tiny hole in the return spout will solve this, but it would save some trouble.
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