8 M Ceramic Smooth Tile Depth Marker 6 Inch x 6 Inch with 4 Inch Lettering gallons-per-day_75-99 spas or hot tubs using

spas or hot tubs using 1 inch Trichlor tablets and when used with a flow indicating device such as Rainbow Model R172080

This is Rola-Chem's Pro Series 300 RC303MP Peristaltic Pump

They are top loading which makes it very easy to add chemicals

When filled with water

K-9022 tests for Chlorine using drop test and Iodometric reagent

8 M Ceramic Smooth Tile Depth Marker 6 Inch x 6 Inch with 4 Inch Lettering gallons-per-day_75-99 spas or hot tubs usingThis ceramic pool depth marker is printed with 8 M and has a smooth surface. It's overall size is 6 Inch x 6 Inch and has a letter height of 4 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 smooth surface tiles are for waterline applications. Please note the M is not 4 inches, but is as pictured. Ceramic depth markers are essential for