The Pro Products SP47N is a 4 lb. container of calcite-based acid water neutralizer media designed to raise the pH of acidic well water. It works by slowly dissolving calcium carbonate into the water stream, neutralizing low-pH (acidic) water that can corrode copper pipes, cause blue-green staining on fixtures, and create pinhole leaks in plumbing. The SP47N is added directly to neutralizer tanks or backwashing filters to restore water pH to a balanced 7.0–7.5 range.

Each 4 lb. bag of SP47N is intended as a refill or top-off for residential acid neutralizer tanks. Most whole-house neutralizer systems require between 0.5 and 1.5 cubic feet of calcite media depending on tank size (typically 9"x48" or 10"x54"). The SP47N is specifically formulated by Pro Products for use in calcite-based neutralizing systems and should be added incrementally to maintain the proper media bed height as the calcite dissolves over time.

Because calcite media is sacrificial and dissolves as it neutralizes acidic water, the SP47N should be replenished every 6–12 months on average. The exact replenishment interval depends on your water's pH level, daily usage, and tank size. Homes with highly acidic water (pH below 6.0) or heavy water usage may need to top off with SP47N every 4–6 months. Check your tank annually and refill when the media bed drops noticeably below its original level.

Yes, the SP47N calcite media used by Pro Products is food-grade calcium carbonate derived from naturally occurring limestone, and calcite media of this type is recognized under NSF/ANSI Standard 60 for drinking water treatment chemicals. It adds no harmful chemicals to your water — it only raises pH and slightly increases hardness by introducing calcium. This makes the SP47N a safe, natural solution for treating acidic private well water.

The SP47N will add a small amount of calcium hardness to your water as the calcite dissolves — typically raising hardness by 20–40 ppm depending on flow rate and contact time. If your incoming well water is already soft and only acidic, this slight increase is usually not problematic. However, if you already have moderately hard water, installing a water softener downstream of your SP47N-filled neutralizer tank is recommended to prevent scale buildup in pipes, water heaters, and appliances.