Alteration to Existing System Application: Alterations to your system may be required when making upgrades to your system or when a renovation application requires the addition of an effluent filter or access risers.
Effluent filters are functional safeguards against solids infiltrating the leaching bed. Solids in the bed have the potential to cause blockages and intern break out (failure). As of 2006 New septic systems are required under the Ontario Building Code to be installed with an effluent filter that meets NSF/ANSI 46 standards.
The Ontario Building Code also requires the lid on the outlet side of the tank to be assessable at grade to allow for servicing of the effluent filter. In some cases due to the depth of the tank this may require the installation of access risers.