Simply completely immerse the whole unit in the water of your pond or water feature and leave the magic to do its work! Within 2-4 weeks the water will become as clear as a mountain stream. The answer to every pond keeper's prayer. The Water Wych is a natural algae inhibitor that has been developed and used by Wychwood Waterlilies for over 10 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 is the Perfect Pond Companion. It works alone or in conjunction with other filters, mechanical or biological. No chemicals! No pumps! No maintenance! The Water Wych is a totally natural product and is entirely in keeping with Wychwood's naturalistic approach to water gardening. Made from a special blend of volcanic rocks, carbons and silicates it is totally free from any manufactured chemicals. What Size Water Wych do you need? To calculate the volume of your water body and thus determine the size of Water Wych that is best for your pond or water feature, use one of the formulas given below. Remember, you cannot overdose with Water Wych - a larger one will work more quickly and last longer! For rectangle and square ponds Basic Formula: Length x Width x Depth (measured in feet for conversion to gallons or metres for conversion to litres) x conversion factor. Imperial Gallons Length x Width x Depth (in feet) x 6.25 = Imp Gals. US Gallons Length x Width x Depth (in feet) x 7.5 = US Gals. Litres Length x Width x Depth (in meters) x 1000 = Litres. Gallons to Litres Imp Gal=4.546 Litres. US Gal = 3.7854 Litres. Questions? Comments? koilagoon@gmail.com Or give us a call 9am - 5pm MST (970) 484 - 9162