Lenin Do you use a first ...
Published by Steve Williams, The Water Guy
Lenin
Do you use a first flush? I have no odors in the systems I design. There are a number of rainwater filter manufacturers the have this built into the design. The cheapest is through Rainharvest Systems in Australia. http://rainharvesting.com.au/ Wisy, 3P Technik an don’t INTEWA make products as well.
It sound sounds like you are getting organic contamination in the tank and the first flush diverts them and then the clean can enter the tank. The web site has an illustration.