The look of a saltwater pond (or top down view) is pretty great in my opinion. I'm sure you'll end up really liking this tub... and the big tank will certainly provide even more of the same. Looking forward to seeing how you set it all up.
so if I were to just run three PVC pipes from one end to the other at the surface, would that be more efficient and as effective in keeping the noise down?
definitely the bottom design. no need for all that extra pipping and the awkward center overflow box thing lol... the bottom design from a couple aspects for the win....
if that thing is going to be enclosed. nobody hearing anything lol...and its shouldnt "suck", looks like itll be gravity fed. so at that point it all depends on flow rate. the higher your return pump is, the more water that is going to over flow, which will make things- louder draining...calm the return pump down and its gets quieter...
Flow is important. Dialing it down means that the overflow wasn't designed properly. It'll be in a plastic sheet enclosed greenhouse so not much noise insulation.
To get a quiet overflow, I've always used to pipes. One running in full siphon and one gated to reduce noise. Both intake pipes and downward elbows inside of an overflow box.
Upturned intakes is the same sound as a toilet drain... unless the flow is so low that the water barely trickles through it. At 5000 gph, this won't be a trickle.
Add to that algae growth and potential for algae to overwhelm 2" pvc inlets...
Both the DT and "sump" are sumps but one will house life and the other plumbing necessitating their separation. Also, the "sump" is where I would do water changes: remove all 100 gals there and add fresh without impacting the reef or the raised scrubber.
All three should be detachable from each other for modification or maintenance
The overflow needs to support high flowrate surface skimming without noise. Being outdoors and only partially greenhouse covered, I expect bugs and dirt and dust... all of which needs to move quickly into the sump and then pumped into the scrubber asap.
Tank is going up this week so really need to close on the overflow design.
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