Depending on the pool,

its orientation to the sun, water hardness/scale, etc.

could change how often we have to do the Pool Grouting,

However, in general, it should be renewed

between approximately 3 to 5 years.

Problems or inconveniences which can cause poor or non-existent Grouting of your pool:

1. It can generate the Gresites/Tiles falling off (This can cause many other problems in the pool).
2. In some cases it can be observed a dark/black colour on inside of the the joint between the Gresites/Tiles, which is not easily removed.
3. It is an excellent crop of algae. These have a place to proliferate in the space or joints between the Gresites, since they can pass behind the Gresite and therefore they will constantly come out and will be difficult to eradicate.
4. In cases where Grouting is almost non-existent, it could be dangerous for bathers, since the joint from the Gresite/Tile is not covered from one to the other (joint), the tile would be exposed, and therefore could be sharp on its edges.