Ecological Laboratories 240021 Microbe-Lift Barley Straw Pellets Plus, 40 lb Treats 1000 gallon pond for up to 9 months or a 2500 gallon pond up to four months Specially made for landscaper and pond service contractors costs less than Bales Enhances substrates and the decomposition process starts immediately Provides a slow steady release of beneficial ingredients through natural activity Recommended for use with all microbe-lift