Just received a call from the caretaker of a rental home I own. Last week there was an algae bloom in spite of ph and chlorine being correct. Did a "super shock" treatment and looks like the algae has died (brownish color instead of green) but the sand filter is not clearing it up. Its a Triton II TR-60, not sure of age or age of sand. Filter is not really gaining pressure, not much coming out during backwashing. In addition, the multiport valve seems to be acting up as there is a flow from the backwash pipe when the port is set to filter.
Seems like this is a good indication that the spider gasket is not working right. Can there be enough leaking past the gasket where it would totally bypass the filter? Or is it likely that there are multiple problems like sand channeling, worn sand, or needing a flocculent for the algae?
He is going to inspect the spider gasket as it seems that it would be wise to replace it anyway. Any thoughts about how to troubleshoot? I am 2500 miles away and can't check on it.
Any help would be appreciated...