reality check on zeolite. the grains do have small pores in them that can theoretically filter down to a few microns but water is going to take the path of least reisitance which will be BETWEEN the grains of zeolite, not through them...just like with sand! You might get marginally better filtraton but, IMHO, this is just a new 'snake oil' being peddled to unsuspecting pool owners!