It should have had an indication right on that line of how acceptable it is . Check with lab that did your test.
That depends entirely on the well water. You should have it lab tested.
Go to the pool dealer and purchase a calcium hardness test kit.
lime calcium is due to a high magnesium count in the water.
Get a water softener.
true
The solubility of calcium nitrate in water at 20 0C is very high: 1 212 g/L.
Yes, is correct.
There is no way to reduce the calcium level except by draining some or all of the water. High calcium levels are a problem mostly in the southwest part of the US. Draining a pool can be dangerous if the water table is high; the pool can actually pop out of the ground.
Such water is called "Hard".
because it has high melting/dissolving point.
Calcium and carbonate (a component of alkalinity) can precipitate from the water column if the product of the concentration of each of them rises too high.
Too much calcium will result in a high pH. This will cause the nutrients to become too concentrated and they will eventually kill the plant.