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Hello Werner,

2 x 90 mm outlet could never bring 30-40 m³/h with airlift. They assume pumps after the sieve. Calculate 10m³/h per 110 mm pipe in gravity mode maximum.

A self made criel solution would be the best in your case.

Regards,
Frank

Good morning, I have three bottom drains 160mm each and one 110mm skimmer. One bottom drain delivers approx. 18.000 l/h with 2 cm level loss only. If you go deeper (e.g. 15.000 l/h) to reduce the loss, the flow rate might be too less and the pipe could clog. A 160mm bottom drain equals to 2 x 110mm....

Hello, 12 Watt for 20000 l/h is without any filter activity possible! As soon as you have bottom drains you loose 2-3 cm, additionally 2 cm at the mesh of the filter and 2 cm on the bio chamber. That means my head is 6cm and therefore the result should be fine. I use three THOMAS AP 60N, which is th...

My result is 65m³/h with 90 Watts. Is it okay?

Frank

It's an custum made endless belt filter,
Inlet: 3x 160mm for bottom drains, 1x 110mm for skimmer
Outlet: 1x 315mm
Belt: 100µm Sefar mesh
Max.: 100.000 l/h

I use the filter for 60-65.000 l/h therefore I have 2-3 cm difference only before the next cleaning.

Besr regards,
Frank

Water movement due to an airlift and center bottom drains:


Preview directly after some pond and filter changes 2018:

Ok. Why you are going to replace the crielsieve?

Frank

Hello Frank,

the best thing would be a strong pump to blow the muck away. A pressure washer could also help.

Best regards,
Frank

Well done!

How many liters do you move per hour?

Frank

Hi,

have you had the chance to test?

Regards,
Frank

Thanks

The "90 degree bend downwards" will reduce performcance compared to usual airlifts, right?

Hi Ron, until now I am a friend of membran airlifts. With less air I get better results. Therefore I compare two cases of membran airlifts at the same enviroment: a) 2 x 160 mm airlift with 45 l/min air or b) 1 x 200 mm airlift with 90 l/min (2 air pumps parallel) Both airlifts with the same length ...

20.000 l/h with 12 Watt you could reach without delivery head from my point of view. In a real filter configuration with 5 -10 cm delivery head the yield should be less, isn't it? Since the Secoh SLL 20 is not produced anymore, which air pump should be used for the pressure chamber to reach 20.000 l...