Lo-Chlor Chemicals MiraClear 2.8 Ounce Shell Pool Water Clarifier - 3 Pack Three 2.8 ounce MiraClear shells Place in pump basket to clear up cloudy water and improve your water quality MiraClear coagulates finer particles and even algae improving filtering efficiency No mess, hassle or measuring - one MiraClear shell treats up to 30,000 gallons and lasts up to 30 days Note: Mira Clear is NOT recommended for use in D.E. or Cartridge filters