Mint Plumbing & Heating

Sink Waste Disposal Units Fitted Surrey

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T: 01737 352962

Helping get the most out of your plumbing...

Sink Waste Disposal Units

Sink Waste Disposal UnitSink waste disposal units are usually fitted directly under the kitchen sink and grinds soft waste (such as vegetable peelings, tea bags, fruit skins, fruit stones, nutshells, corncobs, crust etc.) to a pulp before it gets into the drain. The pulp is then washed down the drain without causing a blockage.

Fitting to sink

Most waste disposal units fit to an 89mm (3½ inch) sink outlet rather than the standard 38mm (1½ inch) outlet. Some sinks will have the large hole; double sinks will often have the standard outlet in one bowl and the larger outlet in the other - which makes good sense as you end up with a 'conventional' sink as well as one fitted with a waste disposal unit.

When the sink only has a standard 38mm (1½ inch) outlet, you may be able to find a waste disposal unit with a smaller inlet (although these are not so common and tend not to work as well) or be able to enlarge the hole in the bottom of the sink. Generally it is only possible to enlarge the hole on aluminium sinks - a suitable cutter may be available from a local hire shop.

Most disposal units do not have an arrangement for dealing with an overflow outlet from the sink; if necessary the overflow should be fed into the trap after the disposal unit.

Waste disposal units vary in height depending on the model; often they will not fit between the bottom of the sink and the shelf in the cupboard - so the shelf will either have to be cut to form an aperture or removed completely.

Waste connection

Most waste disposal units connect to a 38mm (approx 1½") waste trap and pipework - generally Bottle or Grease traps must NOT be used. Depending on the model purchased, and the type of waste trap already fitted, it may be possible to connect to the existing waste pipe with only minor changes.

Try to arrange the waste pipes to achieve a fall of 15 degrees (26cm per metre), this will help flush the waste material along the pipework.

Where the waste pipe discharges into a gully, the outlet must be below the grating - if necessary, the grating must be cut away and an extension fitted to the bottom of the waste pipe to take it below the grating.

Electrical connection

The electrical supply for a waste disposal unit generally need to be 220/240volt (UK), the current required depends upon the model and the supply should be fused according to the installation instructions provided. The electrical supply should be made in accordance with Part P of the building regulations.

Operation is controlled either by a manual switch, a wireless remote control or automatically depending on the model/wiring. Wireless remote control switches can be purchased separately.

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