How does a drilled tank work?

How does it work? Water flows into the overflow right? Overflow fills and the whole drilled in the back allows water to fall to the sump. Wouldn't the sump overflow since the tank has more water than it and is constantly draining into it?

 

There are usually two holes in the bottom of the tank. Both are inside of an overflow box One is for the return water that comes out in the main tank. The water level is near the teeth of the top of an overflow box. As is goes into the overflow box it then goes into a pipe and back down to the tank.

 

the sump has a pump, that means that it is the pump that is supplying the tank by pumping volume X as long as the drain hole can handle (volume X)the return flow, their is no problems.

 

The way the system works acually starts with the pump. Imajine you start with your sump full. The tank is not completely full so the water level is not up to the overflow point where the water drops down into the drilled hole. Now you turn on the pump which begins pumping water back into the tank. When the pump fills the tank to the overflow point water starts to spill into the overflow and drop into the drilled holes. from there it goes down to the sump where the water is being pumped from. So as long as your return pump is pumping a little less than your overflow has the ability to handle the water level in your tank will stay right at the overflow level.

 

Right after I posted this question it clicked. Lol. Water can't be draining unless water is added. Therefore never overflowing the sump. Bah. I'm an idiot.

 

Its a very confusing simple complicated balance when you first start considering it. I had the same questions when I first thought of setting mine up.

 

you said it!...... not me lol j/k

 

haha. I hate you. Lol. j/k. Very simple, yet complicated, but not. All at the same time.

 

I had the same question when we started out Once I saw an actual tank and overflow in action, it all made sense. The difficulty is just picturing how it would work if you had never seen something using this concept before. Once I saw a tank with an overflow and return pump I was like "...how am I so stupid?" We just think too hard I guess