Basic Water Flow Question

[carlyai]

If I have say a 2 m high filter that I want to backwash (from the bottom with no pump), into a same dimension minralization tank, mounted at the same level, then only half the backwash water will flow into the mineralization tank. I won't completely empty the filter. 

So the only way (without a pump) to empty the filter on backwash is to have the top of the mineralization tank level with the bottom of the filter. Is this correct?

I would like to backwash the filter into the tank without digging the tank in the ground or raising the height of the filter.

(Go easy on me, I'm just a poor old retired person.) ????

[sometimewoodworker]

1 hour ago, carlyai said:

So the only way (without a pump) to empty the filter on backwash is to have the top of the mineralization tank level with the bottom of the filter. Is this correct?

That sounds correct, water doesn’t flow up hill without assistance.