I assume that the fine dust particles that end up on my automatic cover end up in the pool when the cover is open. Which is not often, but with the wind??? I travel every week for work M-F so every Saturday I get up before the wife and kids and go down with my tests kit and check everything that I possibly can. Ph, FC,cc, ch, ta, cya, phosphates, salt. My ph creeps .2-.3 per week due to the SWG I am sure. So my handy Taylor guide that came with the kit says to add 1.75 qts of MA. Everything else is generally in line and my saturation index according to the wheel is around .5 once ph is corrected. The wife checks the pool daily with 7 way strips to make sure nothing goes sideways during the week. I do also add the capful of phosfree and a splash of clarifier as "insurance" along with a couple seconds of LC in each end. (So I don't have to overwork my SWG). When the phosfree and clarifier that I bought is gone I will probably just stick with the clarifier as suggested. Sometimes I find a steal on chemicals (like 12.5% fresh LC for $1.99 gal) and I stock up. And I know, it doesn't matter how much of a deal they are if I don't need them. But the LC has many uses and the $11 clarifier was $3 at a store that seasonally carries pool chemicals.