prism value fragranced toilet cistern blocks helps prevent the build-up of lime-scale. this item comes in a pack of 8 so definitely a smart buy! toilet cistern blocks clean and freshen the toilet bowl leaving a delicate fragrance after every flush as well as preventing lime-scale build-up. each block comes in a water soluble wrapper to help prevent mess and are safe to use with septic tanks and all other toilet cleaners, including bleach.
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