if the viscosity becomes such a problem then making the copper sulphate pentahydate an additive that you put in to:
1: colour
2: increase the thermal conductivity (slightly but better than nothing)
3: kill anythign in there
Is a viable alternative to the higher concentrations. Really though we could stand and argue this for months testing is the only real way to go. i.e. see how well the pumps perform under long periods of stress.
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