Show us your overflows!

[livingart]

the "to sump" pipe determines the height of the tank water

the u tube is allowing tank water to flow to the "to sump" pipe container

so long as the u tube is full of water it will flow

water is pumped from the sump, this then flows through the overflow system to the sump

when the sump pump stops the water displacement remains static, no flow

the outlet of the pipe from sump pump needs to be above level of tank water to stop flow back to the sump if pump stops

this can be achieved with a non return valve or a hole above water level to break syphon back

[SamH]

Thanks for the summary LA

[livingart]

was actually trying to clarify for myself

[SamH]

Well you cleared it up for me too. Looks like I'll be off to Bunnings this weekend to get some fittings Is 20mm too big for the "To Sump" pipe or is it better to be oversized than undersized? Thanks

[livingart]

big is better

[Ira]

Well you cleared it up for me too. Looks like I'll be off to Bunnings this weekend to get some fittings Is 20mm too big for the "To Sump" pipe or is it better to be oversized than undersized? Thanks

You can't oversize it...Not within reasonable way anyway. 20ish mm is good.

[SamH]

I'll ask for some 20mmish fittings then