Every 6 months our technicians do a full tear-down of the pool filter.
We inspect all grids, cartridges, and manifold to ensure water is being properly filtered. If holes or cracks are found we come prepared to replace anything that is damaged.
After cleaning and inspection we lubricate o-ring and reassemble filter.
Grid filters require 1 lb of diatomaceous earth per 12 SQ ft of grids so we add appropriate amount.