Overflow From Exit Valve

[DennisPennis]

New place has an infinity pool - however, there seems to be a problem with the water overflowing out of the big tank.

There is a big blue tank that is about 1.5m wide x 1m tall that has a ball valve in it like in a toilet.

Then there is the pump and a smaller red filter, which I assume is the sand filter.

As soon as you fill the system up with too much water, the water just starts running out of the overflow valve from the blue tank.

I have left it on circulation for the moment.

Do you have any ideas what I should do?

What does the blue tank do, do I need to isolate this from the rest and just have it running from the red sand filter?

Edit: I turned a valve and that seemed to self fill (blue tank has mains water inlet) so the inifnity started but there is still a tiny amount of water flowing out of the exit valve onto the street below. Also, the pool is not infinity at one edge of the pool - is there a way to make the water flow in faster so that enough water is flowing in to make it 100% infinity?

[DennisPennis]

What happens is that I change the valve in the 1st picture and the blue tank immediately starts to go lower, the pool fills up and flows over the sides into the trough, but then the blue tank starts to fill up again from the water inlet, after about 5 mins, a little bit of water starts to come out of the exit pipe and keeps coming out.

Edit: also, when someone dives into the pool and sloshes water off the negative edge, the trough catches everything but then a whole load of water comes out of the blue tank's escape pipe.

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[PoolGuyNJ]

RECIRC or FILTER should not make enough of a difference.

The blue tank is a surge tank.

Do you only have one pump?

Scott