Probably 6 gallons when you are opening in the spring. Zero if you are closing it up for the winter. In the heat of the summer, enough to keep your chlorine level at 1-3PPM.
Clorine is dangerous, see this website: http://www.kewego.com/video/iLyROoafY8DO.html And here is how I handle my Pool: http://live-efficient-green.blogspot.com/2009/07/pool-with-no-harmfull-chemicals.html Hope this helps.
After the pool water is clean & clear..i use a half gallon in the mornin & another before bed. If you have alot of swimmers you can use 1 gal at night. :) ALWAYS check your clorine before people swim-just to be safe :).
cost to recoat a ,pool 20 by 40
Chlorine*
That depends on where you are and the price of water in your particular locality.
because it has clorine
Approximately 200 lbs.
about 3 oz.
Chlorine has been linked to asthma in young children.
clorine
the amount of salt required depends on how much water is in the pool You will need enough salt to reach a concentration of 4000 ppm (parts per million) to start. Have the water tested for salt content at your pool shop (usualy free), then add then add enough to reach 4000 ppm.
how much chlorine do I put for a 1,718 gallon pool