Nice ya!!
I'm interested in understanding: will you use only concrete or will place pvc/epdm to insulate?
I don't make the final choice on he sealing, it will be EPDM or polyester or PEHD depends on the m² prise
seems energy is not so expensive in belgium on the base of your filtration system...
no because the airlift
what about the airlift in terms of efficiency, reliability and energy costs?
You can tell on 10w for 10m³ to 11m³ flow in the best case, I will use 6 airlift as pumping the pond with 2 times 60l/min air pumps, in this case normally I expect to have 90.000l/h flow with 120W - 150W with only 4 airlift in working, so I have reserve of 45 m³/h with de two last airlif and one air pump more, never now watt you need in time
In term of energy consumption the airlift is the grand champion, but to do this, you need, 1.8m deep with airlift of 1.7m hight and gravity filter system
Valerio the paper filter is automated to change and waste the clogged paper by itself
