Information from the Mega Lab web-site. (Note: It doesn't appear to be primarily designed to increase settleability/supernate yields, however that is our goal when using it).

XLR 8™ - NATURES OWN WASTE TREATMENT SYSTEM - Significantly improves waste system efficiency using natures own biodegraders. Highly concentrated, scientifically developed, naturally bio-energized waste degrader which uses the power of highly diverse strains of bacterial/enzymatic activity to efficiently break down organic waste as well as difficult, non-biodegradable compounds (detergents, paper, oil, grease, hydrocarbons and phenols) in commercial, institutional, industrial and municipal wastewater systems. Works in either the presence or absence of oxygen and is capable of digesting compounds which are normally toxic to natural sewage bacteria. Maintains systems in an active, clean and free flowing condition without harm to sewers, field tiles or tanks. Most economical and effective for reseeding systems where bio-kills have occurred and for maintaining maximum bio-system efficiency on a long term basis. NON-CORROSIVE - NON-PATHOGENIC - STABLE.

We did try a jar test, using digester sludge. One bottle had the enzymes, the other did not. The only noticeable effect here was that the supernate became inverted within a few hours (the clear product had moved to the bottom) in the enzyme sample. This seemed extremely counter-intuitive, as we regularly find the supernatant towards the top of the level in our holding tank (even when using the product). We have also occassionally tried from the bottom with no success. As the days and weeks went by with the jar test, no other difference was noted.

I have been thinking of experimenting with more of a "visual" food source (a piece of banana perhaps) and attempting to see if there is any noticable difference in degredation. As the product description suggests, it should do a better job of breaking it down.