Lifeguard Training Diving Brick - 3.2 Lbs. depth-marker-conveys_Numbers Only It is not compatible with

It is not compatible with acrylic spa surfaces

This ceramic pool depth marker is printed with 9 1/2 FT and has a smooth surface

all Hammerhead motors are pressure tested to ensure that they will not leak under normal use

The Frontier IV has a weight capacity of 400 lbs

Zeobrite is a product that filters particles as small as 3 microns

Lifeguard Training Diving Brick - 3.2 Lbs. depth-marker-conveys_Numbers Only It is not compatible withWe designed and manufactured our diving bricks as an inexpensive rescue training tool for Lifeguards and Emergency Rescuers. The brick is soft and easy to grab. The brick can also be used for swim strength training. The brick should be dropped carefully into the pool and not thrown. The brick will not harm the pool bottom or sides. It is a synthetic rubber composition.