Our local Leslie's instructed me to add 20LBs of Hardness Plus to raise the calcium level. OK, no problem. However, they tell me (and have numerous times in the past) to add 5 lbs. one day, recirculate, 5 lbs the next, 5 lbs the next and 4 days later the last 5 lbs. The instructions on the bucket mention nothing about spreading it out over a period of time. Why does the pool store say to do this? What is the benefit? The only think I can think of is that it allows you to measure the level as you are adding, see where you are each day. Any comments appreciated!