The watermill of Kalogeroi (meaning “of the monks”) is located near the village of Stylos. This is one of the largest watermills in Crete, with five water outlets. It operated with five water wheels and five pairs of millstones. It was supplied with water from the River Koiliaris via a trapezoidal stone water cistern 5 m south of the mill. The water was channelled through a wide wooden flume (vayeni) into a hole in the base of the south face of the mill (zourio), where the waterwheel is located. The mill had horizontal waterwheels (known as the Greek or oriental type).

Watermills like that of Stylos were mainly used for grinding grain. In the Apokoronas region, watermills were also built in the 15th century for sugar processing.

On the main face of the mill are the water outlets with the corresponding openings providing natural light and ventilation. The mill of Stylos is a three-room mill, as the original one-room building was modified and added to. The first room was used for workshops and access, the second housed the pairs of millstones, and the third was the storeroom. This last room often served as a rest area for the workers. It had a fireplace due to the humidity, and it was also used for preparing food.

To the west of the watermill, a one-room olive mill was built at a later date. Initially the two units operated in tandem, but with the advance of technology the watermill ceased to operate and became the storeroom of the olive mill.

The watermill “of the monks” belonged to the dependency of the Monastery of St John the Divine of Patmos and was part of the system of watermills built by the monastery during the Venetian period to process the agricultural products of the dependency. According to the local inhabitants, the watermill was ceded by the monastery to the community, whose property it remained in the modern era. It was in use until 1960.