We have something similar on each of the 50.000 litre tanks at work. They
are home-made and just have a pipe, lever, wheel and a 2-litre coke bottle
at the end. When the tank is full the weight of the water pulls the lever
down and shuts the supply off. Brilliant. The only problem is if it rains
very heavily the tank can be turned off before it is actually filled. They
have been there for at least 15 years and are working fine. (Had to replace
the coke bottles a few times

"John Charles" wrote in message
...
I am considering installing a rainwater tank for garden use. An
accessory that has been suggested is the "Levetator" water level
indicator. These types of devices are purely mechanical and use a
float, counterweight and pulley to lift a plastic ball on the outside
of the tank. This moves up and down as the water level rises and
falls. Has anyone had any experience with these systems? In particular
I would like to find out how reliable they are and if they are likely to
jam up when left exposed to the elements. Also how difficult are they
to install?

Regards
John Charles