Rocks

It’s not uncommon for rocks to be the preferred decorative element for adorning the edges of a biological pool. While personal preferences always exist, we can establish some rules for choosing the stones to be used near the water.

First, the rock must be waterproof, meaning it shouldn’t crumble, release chips or minerals into the water, or even dissolve. Therefore, only solid rocks like granite, basalt, and hard limestone should be considered.

Another important rule is: the larger the water surface, the larger the rocks can be. A little pool with a large rock appears optically smaller, and pebbles placed on the banks should be of a certain size so as not to be obscured by surrounding aquatic vegetation.

Choosing rocks should be guided by the geology of the region, as white limestone rocks may look strange in a granite area, and vice versa.

It is advisable that all rocks are firmly set on the banks of the biological pool so that they never move. Once firmly in place, they can serve as plankstones, stepping stone bridges through the shallow waters of the planted area, or form part of a waterfall wall.