Transforming input garbage mixt. of fermentable organic waste materials and non-fermentable and/or non-organic waste materials including plastic materials into sepd. output products comprises: (a) fragmenting the input garbage mixt. in a coarse grinder to loosen and break it up without grinding down or removing the plastic materials; (b) depositing the ground garbage mixt. including the plastic materials into non-compacted swathes and fermenting the fermentable organic waste materials by maintaining the mixt. at elevated temp. and humidity and turning the swathes periodically during the fermentation period and (c) loading the garbage mixt. from the fermentation stage and drying it and conveying it to at least a first and a second grinder and screening stages in-series in order to obtain desired screened output particle size. In the first grinder stage the fermented garbage mixt. is ground to particles of a selected coarse size of 10-30 nm by passing the mixt. through the first grinder stage and then conveying it through a trommel with a screen of the selected coarse size so that coarse fermentable garbage particles fall through as a first fermented output. The remainder of the ground garbage mixt. retained on the screen is conveyed to a reject output as a non-fermentable waste prod. In the second grinder stage, the first fermented output from the previous grinder stage is ground to a finer particle size of as low as 1mm. by passing through the second grinder stage and conveying it to a trommel with a fine size screen so that fine fermentable garbage particles fall through as a second fermented output. The remainder of the ground garbage mixt. retained on the screen is conveyed to a reject output as a non-fermentable waste prod. In the first and second grinding steps, the coarse particle size and the fine particle size are selected so that a high throughput of garbage input can be processed continuously by successively grinding and screening to the desired output particle size.    USE -   The process enables household waste to be transformed into usable output prods., esp. to an organic prod. suitable for fertilising soil (from the fermentable materials in the waste) and into other prods. for industrial uses (from the non-fermentable materials in the waste), suitable for compressing and heat moulding into materials for fencing, road-bedding or paving.    ADVANTAGE -   Although large, dangerous and undesirable objects, such as combustible cans, containers or toxic materials, batteries, tyres, ferrous and non-ferrous metal objects must be removed manually by employees or by automated apparatus, there is no need to remove plastic matter, as the invention provides for its separation and removal as a usable output prod.