The OXY-08NP attaches to your Sidekick, allowing it to inject a small amount of chlorine or hydrogen peroxide solution into the unit during backwash. This can help to prevent the Sidekick’s media bed from being fouled by iron/sulfur bacteria or tannins, extending the life of your Smart Blend media, and improving the overall performance of your Sidekick. The OXY-08NP installs in minutes, by simply attaching the tubing to the Nitro Pro control valve, and activating the Oxy-Clean™ program. CSI recommends the use of the OXY-08NP on any application with >3ppm of iron, or anytime the presence iron or sulfur bacteria is suspected.Tank Size 5 Gallons