Calcium deposits usually originate from high levels of hardness, pH, or alkalinity in the pool water, or from setting grout or mortar. The best process is called “Bead Blasting”. It is the process of shooting perfectly round glass beads or finely crushed Kieserite (Natural mined mineral salt often compared to Epsom) at a high pressure to remove the calcium deposits without harming the tile.
At times, depending on the age and wear and tear on the existing tile over time, the tile will have a hazy look after it has been tile cleaned. This caused from either the glossy finish on the tile wearing down or scratches from wear and tear over time. A pool tile sealer is recommended to bring back the shine and luster from your pool tile.