My biggest problem is the phrase that I am hearing more and more from public health consultants "just put one under the pot wash sink". Well that is just fine and dandy for ticking the box for the water board, but what about the rest of the drains in the kitchen? And the fact that the trap under the sink is very inefficient and a potential health hazard to what is supposed to be a clean kitchen.
The plight is not help by supposed governing body's who just won't put their chap on the block and be counted. The water boards, EHO and building control tend to be draconian or woolly about the matter.
One thing I know for sure! This issue will not just magically disappear, but the issues being forced into a kitchen needs to be addressed.
Grease traps do work! When they are placed correctly as per their original design and building control regulations, this happens to be located outside of the kitchen demise as part of a building solution in the form of a professionally maintained trap, not as a box placed under a sink.
Firstly let's discuss the boxes placed under sinks in kitchens. These units do work to a degree but they are often underdized and incorrectly positioned. FOG (fats, oils and grease) remain in quite a fluid state in warm temperatures till about 18 degrees C. Waste water from a potwash sink or dishwashing machine is normally higher then this temperature therefore the bulk of the FOG will bypass the trap and solidify in the main drain, this is counter productive to putting the trap in in the first place - this practice needs to stop! A grease trap under the pot wash sink may as well be a paper bag, but put that trap further down the line and pick up a few more waste streams!! Now we are onto something!