I have acid well water (5.5 pH) with sediment, so I have a main line water filter, an acid neutralizer and a water softener. I add about 40 lbs of calcite to the neutralizer tank twice a year to keep the level between 50 and 75%, and 40 lbs of salt to the water softener every 3 weeks or so. Both tanks backwash into the house drain pipe. There's a Zoeller(?) filter in the septic tank outlet pipe which clearly does its job. The filter routinely gets clogged with white-ish pebble-sized pieces. Is that from the calcite? If it is, what can I do about it? We're very careful about what goes into the septic tank. The filter first clogged about 10 months after the house was built in '03. Since then I'm lucky if I can go 3 weeks without cleaning the filter, all year round. I check it at least once every 2 weeks. It's been this way for years. Thanks for any insight and suggestions.