Screen type pre-filter

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werner
Posts: 6
Joined: 04 May 2019, 10:06

Screen type pre-filter

Post by werner » 25 May 2019, 09:44

I wonder which pre-filter to install in my (swimming)pond.
I looked on the forum and found some DIY (criel) sieve constructions but those seem to exist on the market...
Most gravity fed screen sieve pre-filters have though a very small outlet (2' or 50mm internal diameter) which makes them suitable for pump operated systems but not for airlift as I understand we shall limit as much as possible pipe-losses due to too small pipe diameters. We want large volume water displacement at low pressure so we shall aim at large pipe diameters. I think I understood that.
Now I found 2 gravity fed sieve filters with large inlets and outlets:
- Aquaforte LOW XL with 3x110mm inlets and 2x 90mm outlet and
- Supersieve Large with same pipe connections.

Both are claimed for 30-40m³hr throughput. But they come not cheap.
Despite this all: they work with a height difference between the incoming water level (nearly at pond level) and a much lower level in the 2nd chamber communicating with the pump. Can this screen type of sieve work with airlift? If not why not?
Many thanks...

werner
Posts: 6
Joined: 04 May 2019, 10:06

Re: Screen type pre-filter

Post by werner » 09 Jun 2019, 22:17

Anybody?? :unknown:

Frank
Posts: 52
Joined: 24 Apr 2016, 22:04
Location: Ceylon

Re: Screen type pre-filter

Post by Frank » 09 Jun 2019, 23:21

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

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