You'll need to give us more details on the pool. Usually, lime/calcium buildup is due to excessive calcium in your water. Calcium is added to protect concrete and tile pools but is pretty much useless for vinyl and FG pools.
Please let us know what size pool you have, what size and brand pump and filter, and the following test items (a pool store should test them for free):
FC (Free Chlorine)
CC (Combined Chloramines) and/or TC (total chlorine: TC=FC + CC so it's easy to calculate)
pH
T/A (Total Alkalinity)
CH (Calcium Hardness) --these two, T/A and CH may tell us a lot.
CYA (Cyunaric Acid aka, Stabilizer)
Any metal tests they want to do. They'll probably do phosphate testing but unless it's super-high (> 3000) it's irrelevant.
Good luck!
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