Royal Flush Cistern Blocks rapidly degrade organic solids and continue working after discharge into the sewer or septic tank preventing odours & blocked drain-fields. Regular use of Royal Flush ensures the toilet system remains trouble free.Biological formulationCleans deodorises and freshens toilet bowl with each flushKeeps systems clean and odour freeHelps to prevent blockages and limescaleLong lastingLightly fragranced for optimum benefitContains germicideHelps prevent limescalePack of 24 blocks50kg tubWhen not in use keep closed in the original container. Keep out of the reach of children.