[A & J Owen Window Cleaning]

hi mate looks like you have a air lock on the 400. as air is trapped at the top thenthe only thing is to unscrew the lid and fill to the top so water pushes the air out the 2nd tank

[Clever Forum Name]

The footprint of one ibc tank must be smaller than the 2 tanks side by side ?

Darran

Both tanks are along a wall mate. Its an issue that needs addressing as each day its a lottery on who fills up first or the night before. But this will help, with the water butts as well, we have close to 2000L. Be so much easier with 3x ibc's (we dont use that daily lol)

[Smudger]

So no way to re arrange your storage space ?

Darran

[Clever Forum Name]

So no way to re arrange your storage space ?

Darran

Working on it soon but just too much stuff and busy lol

[Ian Lancaster]

If the bottom of both tanks are at the same level then as you say the water will level out between them.  As there is no build up of air pressure then the only thing that can stop (or in this case, slow) the water flowing from one to the other is the diameter of the pipe connecting them.  The flow rate through normal 1/2" hose with connectors will be very slow, considering that there is minimal 'head' in the first tank.  The only way to ensure the levels are always equal is to have a larger connecting pipe.  I used inch and a half to join mine together via the outlets and levelling was almost instantaneous. 

The cross section of a 1/2" pipe is just under one fifth of a square inch, the cross section of a 1 1/2" pipe is just over one and three quarter square inches, so nearly nine times bigger!!

[Clever Forum Name]

Was just about to update this lol.

We turned off the water production and waited/wanted to see if it would level and it did.

Looks like the connecting hose it way too small, but we have lots of 25mm internal hose so all good.

Thanks everybody and Ian