Hey englishman, you have been doing some research, maked difference from last convo, well done, unfortunatly its not over & never will be in this hobby, but we all try to keep ahead..lol
where is your reference material coming from to begin with bud?
Firstly, im guessing by everything you want to go the
sump route, thats cool, just have to factor is you can with minimal fuss!
5000lt return pump, are you aware of headloss notion yet?
Just as a matter of course if your going the drilling of the tank route id split the return piping into 2 so its not a total jet stream on one side.
The power head in the
DT is suplimental of the return pumps output. basicly you looking for plenty of flow where it matters, & thats in the main tank so it keeps all areas oxygenated, little to no dead spots, & makes for a cleaner tank as
detritus (junk & gunk) are keeped in the water column (in suspension) so your overflow can capture it & wisked away into the
sump for collection & further bactierial conversion (natral filtering) before heading on a closed loop back to the
DT.
ron, your familur with swimming pools & there surface filtration capture boxes, same principle. Forget about the actual specific plumbing for a sec, & picture the box with water overflowing into, you have a hole, & a piece of straight tube to a tank below. , once that box fills to the top of the pipe, it drains into the pipe. simple - although loud, like a toilet empty 24/7 ! Now a durso is nothing more
than that pipe with a tea pot bend (2 x 90deg angles) to allow it to be submerged & thus quite. Same principle, the pressure in the overflow box builds up with the incoming water & when it reaches the flattest part on the elbow down the pipe it flows.
as for the
sump, keep your themo's one at each end, 2 is good for redundancy. id suggest deploying a filter sock for the dump pipes, instead of a
wet/dry filter block. Im pro miricle mud style, its a
hot debate,