 The answer to every pond keeper's prayer.
The Water Wych is a natural algae inhibitor that has been developed and used by the Henley family for over 15 years and used to maintain crystal clear water in the viewing ponds of its world famous Waterlily Collection.
The Water Wych absorbs excess nutrients (phosphate, nitrate, etc.) from the water, which together with sunlight, make algae grow. It also inhibits string algae (blanket weed).
The Water Wych works alone or in conjunction with other filters, mechanical or biological. | 
