Conducted annual service on whole-house filtration system. Replaced all 3 filter cartridges (sediment was VERY clogged). Sanitized housings with hydrogen peroxide solution. Verified proper flow rates. Checked UV bulb - intensity meter showing 82% - still good but should plan for replacement at next service. System performing well overall. Water quality testing indicates excellent results across all parameters. Recalibrated pressure switch on booster pump. Left extra O-rings for emergency use. Everything looking great!