Siphons are practical for cleaning pools or tanks constructed on
hillsides.
Some years ago I made a siphon powered pool cleaner for a small resort
hotel in Coroico, Bolivia, where we have a Watermotor turbine demonstration
site.
This resort has two swimming pools but didn't use filtration or
chemicals to keep them clean.
Therefore, the pools were always green and getting steadily greener until
eventually drained, scrubbed and refilled.
They often took days to refill, especially during dry season when they
were most needed.
This made it tough for guests accustomed to chemically treated and
filtered pools.
First
Model
I put a vacuum cleaner brush on the end of a 3 meter x 1" plastic pipe.
The plastic pipe was hooked to a piece of 1" Spiraflex flexible plastic
tube about 3 meters long.
The Spiraflex was connected to a piece of 1" black plastic tubing. This
tube ran down the hill below the pool.
I found that there was sufficient siphon power from a vertical fall of
only 3 meters or so below the pool water level.
The modification to the vacuum cleaner brush was to put a couple small
plastic wheels on it to prevent it from sucking down against the floor.
Basically what you would get in your pool supply store (if you have one).
I put a gate valve on the bottom end of the black plastic tube running
down the hill. This was used to maintain the water in the tube to get it
started.
All that was necessary was to put the brush under the water in the pool
and open the valve at the bottom end of the downhill tube.
A further refinement was to put a very small amount of chlorine in the
water (after dark) and vacuum up dead algae off the bottom in the morning.
The amount of water used to perform each cleaning operation would lower
the pool level about 3-5 cm, or so.
By the way, you can see the actual pools at
http://www.solyluna-bolivia.com/en/ofrece.e.html
Ron Davis,
www.watermotor.net
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