Hi @ alexbiojs, a real hunt.
For the treatment of waste waters a large area for bacterial growth and oxygen is needed.
This edging product is a great idea to increase the surface where bacterias will grow, but in a small space where oxygen will flow from tubes.
The originality of the solution is in a ball that increases the surface for bacterial growth at 2800 square feet.
Maintenance practically does not exist ...
Every 20 years !! the oxygen supply pipes need to be changed.
This is a really useful product and will help many to comply with the legal regulations on permitted sewage pollution.
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I like your comments. great review! thanks for support )