Hi,
I've been learning a lot here the last few weeks, particularly interested in the Calcium debate.
Everytime I get a water test at a store, they tell me to add more Calcium

This last time was the smallest amount "needed"... only another 16KG
I told them that I was not buying it ( both literally & figurtively..lol)
I told them that I had read that calcium wasn't really necessary for a vinyl pool...
they told me that it's not the pool that needs it but rather all the metal components in the system... ( )

I would think that having a lot of calcium on metal would be a bad thing?
( isn't that called scaling?)

So: What's the deal here?
Does a pool pump need calcium to function well?
I also have a heat pump, but don't remember seeing anything about calcium in the manual ( although PH was mentioned)


.......
test scores:
TA : 110
PH : 7.2
CYA: 40
total hardness (calcium): 130 ( they said it should be at least 200 to 350)
TC : 1.7
FC : 1.7
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Thanks for your help,
G :-)
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VITALS:
aprox: 140000 litres, jacuzzi Vinyl inground Lazy "L"
Sum5 Summit Heat Pump 115000 BTU
Zeobrite running in jacuzzi 25 sand filter
3/4 hp pump ( don't know the brand)
pool devil pro
kreepy krauly
Dolphin w/remote ( in shipping, scheduled to arrive next week)
Beachcomber Hot Tub ( #578)
lifestyles hot tub (yuck)