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Bio Production Royal Flush Biological Cistern Blocks Box of 12 (2 Per Card) RFBCB12/2 contain powerful non- pathogenic, enzyme producing organisms, together with a foaming surfactant & water activated colourant to leave a fresh clean look with every flush. Royal Flush Cistern Blocks rapidly degrade organic solids & 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.
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