thank you for responding and i done as you instructed. but i need more help.
i had 2 quart bottles of bioguard brand pool magnet plus that is for metals and put it in the pool last night. i tried brushing this morning and some of the stains did appear to be coming off. however the label said to add 2 to 3 quarts depending on the severity of the stains. the stains are bad enough for 3 quarts and i feel i need to add the additional quart, my question is should i add the third quart now and if so does it need to be the same brand that i added last night or can i go to walmart and buy the metal out and put a quart of that in?

second question, i haven't added any bleach since midday yesterday, cl is 6.0 ph is between 6.8 and 7.2, ta is 150 cya 50 and i have a 21,000 gallon inground pool. the pool is a hint of green. the pool magnet plus said to not superchlorinate after adding this product for seven days. so since the pool is just a hint of green do i still continue with high levels of chlorine and is it okay to do that since i added the pool magnet plus or do i just need to now keep my chlorine levels at 6.0 now and just add bleach as needed and keep trying to brush off the stains? thank you so much for all your help!