Phillip – We are a company that specializes in rainwater and greywater harvesting systems – located in the Chicago area. We invite you to visit our website for a lot of information on options for rainwater and greywater harvesting – http://www.Wahaso.com.
In particular, we like a tank system that is very flexible in the design layout for width, depth and capacity and quite suitable for home cisterns (Atlantis D-Raintank). The tank is assembled on-site and wrapped in a permeable geotextile in an excavation lined with an impermeable liner. The tanks are made from recycled polypropylene and not susceptible to frost below grade. They are perfect below a swale that can collect large quantities of stormwater or rainwater that can then filter into the top of the tank.