8 Ceramic Skid Resistant Tile Depth Marker 6 Inch x 6 Inch with 5 Inch Lettering color_Marine Blue and White there is a concern with

there is a concern with bicarbonate alkalinity which should be between 80 and 120 ppm

These are true readings of Free Chlorine and not approximate values derived from ORP readings

3 M and has a smooth surface

This ceramic pool depth marker is printed with 6 and has a skid resistant surface

8 Ceramic Skid Resistant Tile Depth Marker 6 Inch x 6 Inch with 5 Inch Lettering color_Marine Blue and White there is a concern withThis ceramic pool depth marker is printed with 8 and has a skid resistant surface. It's overall size is 6 Inch x 6 Inch and has a letter height of 5 Inches This ceramic pool tile is printed with ceramic glaze inks, then kiln fired to ensure the finest, most durable depth and safety marker line available. The skid resistant tile is surfaced in the factory, not sanded or coated, for a more reliable slip resistant surface! Skid resistant tiles are for