I am inclined to think the lime scale is forming in the pipes themselves.
The source might be a tank in which C02 is stripped during aeration. This makes it way into the water, and the lime scale is then deposited in the pipes.
As it is PVC, the deposits don't adhere and instead end up in the meters whenever the draw is strong.
You will want to check that your tank doesn’t have a high inlet that creates a waterfall effect.
Hello @WWSteev ,
One solution would also be to treat water hardness throughout the utility.
Ask your consumers and you'll see what the repercussions are for them in their homes: they often resort to domestic treatment systems (sold by specialized companies), experience accelerated aging of their household appliances like washing machines or dish washers, higher electrical costs to heat hard water, increased use of household cleaning products, etc.
I would be willing to bet that any community that has implemented carbon dioxide removal does not regret that decision.