2 tank types from Orenco Systems.
Advanced Treatment
The AdvanTex is a packed-bed textile filter that treats septic effluent to a very high standard. It is popular in the Pacific Northwest and other areas with strict discharge rules. The system recirculates effluent through textile sheets, creating a biofilm that does the heavy lifting. Requires power and periodic maintenance, but the treated water quality is hard to beat.
$10,000 - $18,000 (installed)
Filter
The Biotube filter from Orenco uses a bundle of small tubes that create a large filtration surface in a compact housing. It filters finer than most standard effluent filters, which makes it a good choice for systems feeding pressure-dosed drainfields or drip irrigation where clogging is a real concern. More expensive but worth it for demanding applications.
$80 - $130