enouh for 50 years of life
Baquacil is a non-chlorine alternative used to sanitize pools or hot tubs, maybe both. I'm not sure how to answer your question, but I bet you can find the answers at http://www.baquacil.com/default.asp . Good idea to ask your pool person too.
Zinc is mined from ores containing sphalerite. China, Australia and Peru have the largest deposits.
2008 Mine Production (in millions of tons)
United States 770
Other countries 2,840