I want to put a sink in my workshop which is below the level of the drains. I am considering putting some kind of tank under the sink and using a pump like this
Can anyone point out the problems with this and suggest how large a tank I might need
We have one of these pumps - you will need a larger space than you think due to room for the float. It will not pump out much below the level of the float in the picture too. Depending what you are going to put into the sink you could have quite a large smelly chamber. You can get pumps with magnetic switches that go up and down in a column - it will be more compact but you will still have difficulty pumping it all out. I would look elsewhere for a proper system - have you talked to a plumbers merchant?
Did something similar a few years back at a camp i'm involved with (1500 campers or so, showers, sinks, washbasins etc).
We had 3 domestic sized water tanks into which the grey water went by gravity and then was puped up to the drains via using such pumps (I may be doing them a disservice, but me recollection is they were Clarke brand.)
The plan was sound, but unfortunately the pumps weren't. I'm sure they would have run all day had we not been feeding them with a supply that had a 30ma RCD on it. They lasted about half an hour on average :=((
We had to abandon most of the project, and just had one tank running using a central heating pump and a filter made out of a few bits of 2 x
1 and the lining of my shorts!
Ours is a Clrake pump and we have no problems whatsoever with the RCD - also
30mA.!
I'd say either the pumps or the RCDs were faulty.
Jon
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