fit perfectly and work well, wish they were a little cheaper. The system is perfectly clean for the first 6 months. I usually get some redshale particles in the water system when changing the time in 6 month intervals. I keep a spare o-ring and some food grade silicone grease and a label marker next to the filter housing to keep track of filter changes. I also chlorinate the well before changing the filter, flush the system after 24 hours and then change the filter about 5 days after the impact when the well is back to normal (the impact releases iron and sediment from the well which clogs the new filter be able).
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