Septic tank conversion units are the answer for failing septic tanksFailed soakaway

If you have an existing septic tank then there may be no need to install a full sewage treatment unit, but BEWARE!!

 Septic tank conversion units can be classed as two types:

  1. 'ADD-ON' conversion units that are installed after an existing septic tank, converting it to a sewage treatment plant that can discharge, legally, directly to a ditch. These must have an EN 12566-6 Certificate in order to comply with Environment Agency rules. The FilterPod is the ONLY add-on plant that has this Certificate in the UK.

  2. 'IN-TANK' conversions which are sold to fit into an existing septic tank to 'convert' it to a sewage treatment plant. These DO NOT have the mandatory EN 12566 Certificate and are not accepted by the Environment Agency for an Exemption. You will not obtain an Exemption from the Environment Agency if you fit one of these. A septic tank was never designed to have chambers of the right size and shape for conversion to a sewage treatment plant. Please see the notes on the British Water website for confirmation of this fact.

The EN 12566 test runs for 38 weeks at an independent EN Test Centre. It monitors the performance of the plant under a variety of circumstances - normal use, underloading, overloading, etc. This test costs around £30,000 per plant and you cannot test 'in-tank' systems, as they are not consistent, i.e. septic tanks are different sizes, different shapes, etc. The 'in-tank' conversion kits that are available are cheaper than the 'add-on' plants but what use are they if the Environment Agency and Building Regulations do not accept them as a sewage treatment system?

If the septic tank is integral, i.e. does not leak water in or out, then it is possible to include it as part of a three stage sewage treatment unit by adding a septic tank conversion unit.  The septic tank becomes the primary settlement tank and you add on the missing biozone and final settlement zone in the form of a small conversion unit.  This unit is connected to the septic tank's outlet and the effluent that it discharges is clean enough to go directly to a watercourse within the E.A. General Binding Rules These units are available as gravity discharge or as pumped outlet discharge if you need a higher discharge level.

There are distinct advantages in placing septic tanks in front of any sewage treatment unit as they intercept all slowly degradable items such as tampons, baby wipes, etc. which can cause problems in some sewage treatment systems.

Add-on septic tank conversion units

Please click on:-


FilterPod sewage treatment plant system_S_STP_Pod Primary Tank_1_Email   Biocube Mars septic tank convesion
 FilterPod Septic Tank Conversion to a sewage treatment plant  BioKube Septic Tank Conversion to a sewage treatment plant
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Biokube sewage treatment plant and septic tank conversion website
Page modified 12/11/2012