http://edis.ifas.ufl.edu/BODY_FA008
" A good rule of thumb is to
divide the total alkalinity (in parts per million) by
100 to get the concentration of copper sulfate to use
in parts per million (1 ppm = 1 milligram/liter) "

in other words, as the hardness increases, the concentration should increase. since
you got soft water, you dont need as much.

http://www.ams.usda.gov/NOP/National.../cprsulfte.pdf
Ingrid


"Sky-Catcher" bobhope@nohope wrote:

OK - I can get 500g of copper sulphate on ebay for £6.00 - Anyone know how
much I should add per 1000 litres of pond water to destroy the snails
(without over doing it and cost me too much!).

Thanks for ALL of your help to date....




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