Infiltrator Presby Advanced Enviro-Septic Design And Installation Manual page 9

2.0 SYSTEM DESIGN
Septic Tank
The AES system is designed to treat effluent that has received "primary treatment" in a standard septic tank.
Septic tanks shall be sized according to the Rules.
Pressure Distribution
The use of pressure distribution lines in AES systems is prohibited. Pumps may be utilized when necessary only to
gain elevation and to feed a distribution box which then distributes effluent by gravity to the AES field. Siphon
dosing is permitted; adequate venting is required in a siphon-dosed system or pumped system, which may require
an additional high vent (referred to as "differential venting").
Effluent (Wastewater) Strength
The AES pipe requirement for bed or trench systems is based on residential strength effluent, which has received
primary treatment in a septic tank. Use of the AES in non-residential or commercial applications requires that a
treatment train be included in the design which reduces effluent to residential strength prior to release into the
AES. Industrial (processed) waste shall not be discharged into the AES system. Our Technical Advisors may be
consulted for recommendations at (800) 473-5298.
Effluent Filters
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Effluent filters are not recommended for use with AES systems.
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If used, effluent filters shall be maintained on at least an annual basis. Follow manufacturer's instructions
regarding required inspections, cleaning and maintenance of the effluent filter.
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Effluent filters must allow the free passage of air to ensure the proper functioning of the system.
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Charcoal filters in vent stacks (for odor control) are not recommended by PEI. They can block air flow and
potentially shorten system life.
Flow Equalizers Required
All distribution boxes (D-box) used to divide effluent flow require flow equalizers
in their outlets. A flow equalizer is an adjustable plastic insert installed in the
outlet holes of a D-box to equalize effluent distribution to each outlet whenever
flow is divided. Each row is limited to a maximum of 15 gallons per minute
(gpm), due to the flow constraints of the equalizers. Example: pumping to a D-
box with 4 outlets. The maximum delivery rate is (4 x 15) = 60 gpm. Always
provide a means of velocity reduction when needed.
Two Inch Rule
The outlet of a septic tank or D-box shall be set at least 2 in above the highest inlet of the AES row, with the
connecting pipe slope not less than 1% (approximately
AES Pipe Requirement
AES systems use the bed sizing tables, pipe and installation requirements noted in this Manual.
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Residential systems: 70 ft/br.
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Non-residential or commercial systems comprised of residential strength effluent: 2.14 gpd/ft
Water Purification Systems
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Water purification systems and water softeners should not discharge into any AES system.
© Presby Environmental, Inc., Design & Installation Manual, September 2020 Edition
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/ in per foot). Illustration of 2 in rule:
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