Keep your BN PRO planted in saltwater. This snap-on counterweight offsets the extra buoyancy saltwater adds, so the robot maintains solid floor/wall contact and lets GeoGuru™ AI map and clean with its full 3× efficiency advantage. Why it matters Restores proper traction in denser saltwater, preventing the unit from “floating” and losing brush/suction effectiveness. Preserves precise GeoGuru™ routing (S-path planning) for complete, no-redo coverage. Fast, tool-free attach/detach for seasonal or mixed-water use. Low-profile design—doesn’t block filter access or charging. Designed exclusively for the SUBLUE BN PRO. Install in 3 steps Power off and dry the BN PRO. Align the block with the designated mount and snap it in place. Do a quick float test; add/remove blocks if needed for steady floor contact. Specs Pack size: 1 pair (2 blocks)