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Place bale on the surface of the pond, preferably near waterfall or filter outlet. Do not allow bales to sink to the bottom of the pond. If bale sinks, remove from pond for 24 hours to dry then put it back.
Allow one month for the bale to become effective.
Replace each bale after 6 months of use. For continuous treatment, after 5 months, place a new bale next to the old one. Then remove the oldest one at the 6 month mark.
For best results keep barley straw bale floating on the pond year round.