3x 2550 gal black poly tanks fed by one 3” PVC line, which is connected to two gutter drops on backside of barndo. All the tanks are connected via their outlet. One tank is the feed tank. Tanks equalize from bottom. Inlets are used as overflow/breather. There is a first-flush diverter kit (that is way undersized) that I use as a clean out. I used flexible couplings on the no/low pressure side to allow for settling and to make disconnects easy. I’ve got an industrial-grade automatic surface pump connected to equalization lines which goes through a 200 micron spin-down sediment filter before going into barndo and onto appliances and fixtures. Then, there is 0.5 micron filter system mounted under kitchen cabinets for drinking, ice making, etc.. Tanks are treated with bleach tabs once a quarter.
We get almost 50 inches of rain per year where I am in northeast Texas. My family could probably get away with only 3 tanks, but I’m planning to add more.
I also have two smaller, simpler setups used for irrigation and livestock.
If you go with IBC totes, be sure to paint black or green to avoid algae.
Below are pics of early in the build.
