Mix ½ cup of white vinegar, 1 cup of rubbing alcohol, ¼ cup or water. Then dilute it with four quarts of warm water. Simply spray the mixture evenly over the tub before allowing it to sit for 15 minutes.
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How to Keep Water Clear in Bird Baths and Ponds: Gardener's Supply
Gardener's Supply -- All gardeners want to be green — except when it comes to water. Whether you have a birdbath, pond or a small reflecting pool, chances are good that at some point you'll have to deal with nuisance algae.