The other question I have about kalk is which kind of containers are safe to hold kalkwater solution in the long term?
My plan is to use a 20 or 30 gallon container for kalkwater to use as top-off, and refill this container every few weeks when it runs out. I read that some types of plastic are degraded by the highly alkaline kalk solution, so which containers are OK, will Rubbermaids be all right?
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