This system has been developed to replace "Beadblasting" although used to remove calcium from pool tile for years it also causes irreversible damage to pool tile. The damage caused by beadblasting etch's the glaze on the tile. making the tile porus, dulls the finish and will not shed water as before, thus accumulates calcium much faster than if no damage were caused. Sealing the tile after it has been "beadblasted" will give it the shine hiding damage as if it were not, it hides the damage done by beadblasting, however only for a short time as the water in your pool is high Ph, dissolving the sealer and thus making it ineffective. Your tile begins to look dull, as now it is ruined to a degree, slight or great, never the less, damaged. Remember, your tile was never sealed when it was