In these days the newspapers showed photographs of the famous canals of Venice, but this time with crystal clear water with schools of fish clearly visible. It seems that the absence of traffic with motor boats, which permanently lift up sediments, made the water more transparent. That is, so much movement with boats keeps the sediments permanently in suspension, which makes the water opaque.

What can we learn from this? Two things for biological pools. First, in a clean pool, no sediment will rise, which can make the water cloudy by using the pool. That is why it is so important to proceed with a thorough cleaning to remove deposits accumulated after winter. And second, the partition walls are essential.

The partition walls physically separate the bathing area from the plant area. On the one hand, the walls stop plants from advancing, so they cannot invade the bathing area. On the other hand, these walls catch the waves. If we took a dip in the biological pool, the wave caused by the dive would enter the plant area and lift the substrate on which they grow, if there was no wall. This caused cloudy water instead of crystal clear water.

There are several models of partition walls that we use in our biological pool designs. All partition walls can be used as underwater benches. The screen walls with floats, stabilized by a kind of tubular buoy, comprise most of the separation walls. They are the simplest and fastest model to build and, after all, the most economical. Walls built in masonry and lined with pool liner means more construction and more costs. But this type of wall offers a structure more like a submerged bench. Another possibility is wooden partition walls. Perhaps the most expensive model, but in certain circumstances the perfect solution.