Nonsense.
You have a vinyl pool. You don't need calcium. Biogard comes up with all this bull-oney and mumbo-jumbo to scare you into spending vast amounts of money on their product which you don't need, but they want you to think you MUST have.
Calcium's SOLE function in pool water is to prevent the leeching of calcium carbonate from the walls of concrete, plaster or tiled pools. Since you have a vinyl pool, there's nothing to leech out.
Don't get "Pool-Stored!" Buy ONLY what you need and buy it at fair prices.
For example: Biogard sells another product for raising Total Alkalinity. It's about $12 for a 4 lb bottle. It contains Sodium Bicarbonate--baking soda that goes for $.50/lb in the supermarket. Biogard uses a variant name (I've forgotten it) so it sounds exotic. Trust me: It's sodium bicarb--baking soda at HEAVILY inflated prices.
Your pool store also says a Biogard product to raise pH. It's expensive and has a catchy name like "pH Balance" or something else and is super-expensive as well. It contains Sodium Carbonate (not the same as Sodium BIcarbonate-baking soda). But Sodium Carbonate is also sold at the grocery store as ..... Washing Soda, by good old Arm and Hammer again--but in a yellow box, not an orange one. It's about$.79/lb--far cheaper than Biogard's but chemically identical.
I could go on and on about the ways you get "Pool-Stored" if you don't watch out. The latest fad is phosphate removers. If you are maintaining your pool then there is a 1 in 1000 chance you'll need this product. But if you do, there's 999 that don't. Yet the pool stores would have you think that 9 out of 10 pools need it, rather than 999 out of 1000 NOT needing it.
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