I have replaced calcium hypochlorite with sodium dichloroisocianurate (NaDCC) pool shock as my long term storage chlorinating agent to work in conjunction with my Sawyer .1 micron 5 gallon filter system... this is for emergency water only...to titrate to a couple parts per million in a 5 gal source, requires only small dosages...if you are a metallic cartridge re loader, your powder scale can be used to measure out dosages... one grain (7000 grains per pound) is 65mg...depending on your concentration of NaDCC a grain or grain and half will give you about 3ppm (3mg/liter)... check with a pool test strip... once you have determined your necessary mass amount a simple dipper of a .22lr rifle case can be shortened to provide a volume measure...for my shallow well a 1/2 case full of 62 percent gave me a 3ppm reading... you need to do your own test however...