[what type of clock do you use ?]

I,m still using the  original clock that I purchased in 1958 for 25 pounds. A lot of money in those days, for a young kid with a paper round etc, as I was back then.  It is an STB & it has been a beauty (very reliable) for me. So any 2nd hand STB by  my experience, could be worth the investment. For those that do not wish to spend the money required, to purchase a new clock at today's prices etc.    

[Copper Sulphate]

One level tea spoon (5grams) once a week to 4.5 litres of water through out the breeding season, after I have rung the babies etc.

One small level tea spoon (3 grams) once a week for the race team in 4.5 litres, when they spend two nights or longer in the unit/baskets etc, on the sunday or monday.