In newer systems, there is often an effluent filter, a simple device that, if properly maintained, will prolong the life of the drainfield. They range from 4 to 18 inches in diameter. (See opposite page.) As we have described, the most serious problem with septic systems is the migration of solids, grease, or oil into the drain- field, and the filter is effective in preventing this.

A filter restricts and limits passage of suspended solids into the effluent. Solids in a filtered system’s effluent discharge are significantly less than those produced in a non-screened system.


Moreover, the filter is relatively inexpensive (under $200) and can be quickly installed (retrofitted) in older tanks. The filter cartridge is removed and hosed off. The filters shown on this page are manufactured by in Oregon by Orenco Systems, Inc., 541-459-4449. Another manufac­turer is Zabel Environmental Products, of Louisville KY. (See p. 174.)

One-compartment septic tank with effluent filter

The filter is pulled out by hand periodically and hosed off. This relatively new accessory—-when utilized regularly—can keep solids out of the drainfield.

Retrofit effluent filter by Orenco

This filter—narrower than the one in the tank above—was designed so it could be retrofitted to an existing tank. It is easy to pull out and hose off.


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