why do you have to use pea gravel. i believe my installers did not use the gravel , but just used the glass media???thanks in advance
I believe pea gravel is used to ensure the stability of the media base and prevent channeling of the media. The pea gravel covers what are called the "laterals" in the filter - sort of arms that fan out and feed the water into the bottom of the filter. Pea gravel is heavier and more stable and will allow the flow of the water to occur without channeling of the glass media.
