RainHarvesting by Blue Mountain Companyhttps://rainharvesting.com.au/products/first-flush-diverters/ Tank Townwww.rainwatercollection.com For how to make a simple home-made first flush diverter see pages 8-9 of Texas Manual on Rainwater Harvesting, 3rd edition, at www.twdb.texas.gov/publications/brochures/conservation/doc/RainwaterHarvestingManual_3rdedition.pdf TucsonThe Rain Storehttps://www.therainstore.com/