Filtrite Black Spot Algaecide is a concentrated granular specifically designed for treating clinging algae, particularly Black Spot in pebblecrete, white plaster and tiled pools only. This granule can be directed to specific areas and slow dissolving action of granular will kill and bleach Blackspot and stains.
How to use: Adjust pH to 7.2, place directly onto the affected area, wait 24 - 36 hours. Scrub with a wire brush if necessary. Dosage rates indic