4. Determination of the effluent discharge mode
IMPORTANT! THIS STEP IS KEY TO ANY SEPTIC INSTALLATION.
The polyethylene Ecoflo
®
Coco Filter offers a variety of disposal/dispersal methods of treated effluent depending
on local regulations).
Here are a few methods suggested by Premier Tech Aqua (but not limited to). The effluent of the Ecoflo
®
Coco Filter
may be discharged into (as applicable):
• Subsurface dispersal such like, but not limited to: absorption bed/pad or trenches, at-grade bed, drip dispersal,
or any type of gravelless system, etc.;
• Surface discharge as applicable when conditions and regulations permit it.
Ecoflo Coco Filter treated effluent can be discharged either by gravity or pumped to the final dispersal,
discharge method or a disinfection process.
4.1 Subsurface dispersal
4.1.1 Site and soil assessment
Site assessment and soil conditions are critical to determine the appropriate type of treated effluent discharge. An
accurate assessment of the soil's hydraulic conductivity is essential in planning any septic installation. This
assessment should be performed in accordance with local regulations. Adequate sizing of the soil absorption system
relies on the determination of the soil's infiltration capacity and will ensure adequate infiltration of the treated effluent
into the soil at all times. The soil's infiltration capacity is often expressed as a percolation rate (average time in
minutes that is required for water to drop one centimetre in the soil), which can be determined by a qualified
individual through a field permeability test, a laboratory soil particle-size analysis, or any other method approved by
local regulations. Soil permeability and analysis is most important within the horizon intended to be the point of
application of the treated effluent.
Site and soil assessment must be conducted by competent and duly authorized person as per local regulation.
4.1.2 Required effective soil depth or vertical separation to limiting layer
The vertical separation between the infiltration area to seasonal high groundwater table, impermeable layer or
bedrock must comply with applicable local requirements. Premier Tech Aqua recommends that the minimal vertical
distance between the clean crushed stone (treated effluent distribution zone) and the limiting layer (groundwater,
bedrock or impervious layer) be at least of 12".
Always consider the following recommendations when designing and installing the subsurface dispersal area:
• When referring to groundwater, the Seasonal High Groundwater Level (SHGL) must be taken into account;
• The profile of final grade must be such that runoff water flows away from the septic system;
• The shape of the soil absorption system may vary according to site conditions;
• Various means can be used to promote infiltration in low permeability soils. Contact your local distributor or
Premier Tech Aqua for suggestions.
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