trickling filter

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trickling filter

[′trik·liŋ ‚fil·tər]
(civil engineering)
A bed of broken rock or other coarse aggregate onto which sewage or industrial waste is sprayed intermittently and allowed to trickle through, leaving organic matter on the surface of the rocks, where it is oxidized and removed by biological growths.
References in periodicals archive ?
With the process technology of a trickle filter system stricter drainage requirements compared to the current state can not be achieved secured.
Aqua One Horizon 60 The essential home for the fish, this tank comes complete with air, lights, trickle filter, heater and cabinet.