HTH Pool Care Granule Shock Treatment 5.5 lb active & outdoor play Padded back and shoulder straps electric fuse Padded back and shoulder straps 1 large zippered main compartment with computer sleeve Dual front zippered compartments 2 zippered accessory pockets 2 side open top pockets Quad cinch straps Padded adjustable shoulder straps Grab hook Color washed canvas with genuine leather trim This folder features a 8Cr13MoV blade With economical easy to use solutions HTH is designed to work hard so you are prepared to tackle whatever life throws in your pool When too much CYA builds up it can cause overstabilization or chlorine lock and cloud your water