Septic tank effluent filters - anyone using one? Why so unpopular in the UK?

[Oxbow16]

Hi

 

I came across septic tank filters recently and will be getting one for my tank. It sits in the vertical part of the outlet T pipe and helps keep any remaining suspended solids out of the drainage field. Apparently they are widely used in a lot of the rest of the world, but not in the UK. I wondered why? They're cheap and seemingly effective, so I'm puzzled as to why they're not installed as standard. It seems many people haven't even heard of them, and a lot of the large drainage companies don't even sell them.

 

Is anyone here using one? Any thoughts as to why they're not common?

 

Cheers