I am new here and I am not at all familiar with terms and concepts related to plumbing.

We store well water in our overhead water tank. Since the water is not very clear, we use a sand filter. The filter is basically a big water tank with a layer of sand and a smaller one to collect the filtered water.The present arrangement is shown in this figure.



The problem with this is that the filter is very slow sometimes and when there is heavy use, we are short of water even though the main tank is full. Hence we cannot do anything other than wait.
Since the smaller tank is at the same level ( as the bigger one with filter), probably due to lack of a large gradient, it never gets filled more than a quarter of its size. So I thought of fixing another tank to collect the filtered water at a lower level. To prevent it from overflowing, I plan to use a float valve (Ballcock) to supply water to this tank and a no return valve (check valve) at the bottom of this tank to draw water from it.

The diagram is shown below.


I hope that this new tank, due the large height difference from the main tank, fill get filled completely and will ensure a minimum amount of water for peak usage time.

I have never done this before and so I am not sure this will work smoothly. So I am requesting this community for suggestions / comments.

I may be missing something, but the way you have it drawn it will not work.

it will work

but

should the check valve not hold/close 100% the lower tank will overflow

imo: use a ball float valve for the low tank fill valve

==============================================

"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Why? Could you please elaborate?

quote; it will work
HOW? How will the water in the lower tank get up to the small tank. Once he starts pumping, drawing from the bottom of the tank, the fill valve will open and the pump will suck air.

A motor pump supplies water from well (0) to the main overhead tank 1.
Water gets filtered in tank 1 and flows to tank 2 as well as to the other taps below by gravity.
It will also flow ( by gravity ) to the new tank 3 via the (ball) float valve ( till it gets filled up).
Water from tank 3 can flow out via the no return valve ( check valve) to the taps below, again due to gravity.




Edited 1 times.

how does the pump know when to turn on and off?

Now, it makes sense. Originally, it looked like !&2 were the pump and its tank, then the "things" below it were the storage tanks.

"how does the pump know when to turn on and off?"
It doesn't know. When there is no water, we switch on.

Thank you all for the replies.



Edited 1 times.