Spash Chlor Save is "sunscreen" for pools. It blocks UV from depleting chlorine levels. This is so important in summer when UV is at it's most destructive and chlorine is at the highest demand. Just by adding Chlor Save to an unstabilised pool, will you save up to 40% on peak season pool sanitation costs. NOTE- not required if stabilsed Dichlor or Trichlor chlorine products are used.