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If the pool jet water flow is still flowing very slowly, this is an indication that it may be time to replace your filter element/cartridge.
You can expect to replace your pool filter element/cartridge once a year to ensure your pool water flow is maintained at the proper level. However, pool usage will determine the frequency of replacing your filters.
I would recommend purchasing your replacement pool filters online to save money. Online retailers offer the filters at a significantly lower cost when compared to the local pool store.