I'd really recommend not using copper sulphate. It is corrosive to many
metals, especially aluminium.
In my laser and tig welder I use 20 - 30% propylene glycol in
deionised/distilled water. Propylene glycol is the active ingredient in
most RV antifreeze, without the dye and other additives. I've never
changed the coolant in either. I just add water as needed. The laser's
coolant has to be at least 8 years old and it's still clear and clean.
Les
On 16/01/2022 22:15, dave engvall wrote:
Cu inhibits algae and should do a decent job on most bacteria. So a
bit of Cu sulfate.
Zn chloride and or ferrous chloride inhibits moss but the ferrous
oxidizes to ferric and stains
siding/concrete so use the chloride. In a pinch just use a bit of
Clorox; even peroxide should do the job.
If you can keep the mist away from your lungs you might try isopropyl
alcohol.
HTH
Dave
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