doesnt suck air as it stops at the waterlevel so long as the out pipe in overflow box is same height as the tank waterlevel
i need to correct diagram
i use 32mm or bigger pipe
so long as you fill the bent pipe that goes into tank to start it will work automatically at start of power during power cut
the bent pipe always remains full of water as both ends are in the water
the one i run has the pipe going to sump from the hang on box at the same height as the tank water level this ensures the pipes are always full
as the sump pump starts back up it automatically flows into tube in tank and starts the process again
diagram of overflow
you need to fill bent pipe to start it
we use 32mm pipe and elbows to give good flow out
box on side can be plastic jug with handle hung on side of tank
to sump can be glued or pipe fitting
i think i have pic right size if not please let me know
now your getting tricky
that is a water level float to shut down flow when water level in sump too low
you could fil;l sump with water and pump up to a bucket to see how the whole thing works
check pipe ends and see what fits the best on which pumps
looks like all the gear is there
white pipe from sump to tank
plastic pipe from over flow box into sump connection
water will flow from overflow box to sump then pumped back to tank through white pipe, use red tap to regulate so waterflow is same in as out i think
perspex with holes should sit in top of sump to create layer for water to trickle through into sump
bit hard to sort from photos
hopefull someone more local will read and may be able to help
giant jigsaw
brown box looks like over flow box with pipe to sump tank and ryan is correct on white pipe return, red tap to regulate flow
1 of bigger pumps to return water from sump, pump on right maybe to create flow, water movement in tank in tank
i like to think about the use of oil as a shock absorber
does taking the oil out of the earth increase the sharpness of the earthquakes
well, i don't like to think then