Some of the gallons of fast input into septic tanks that has been posted on this thread is way off! 10-12 gallons per input shot is so entirely bogus. Where do some posters think that single shot of a bathtub with 30-40 gallons in it goes anyway? Let me help! If you have a septic system, right directly into the septic tank as fast as it can go!
AND
It simply goes in the same septic tank EVERY time the tub is emptied and the septic tank doesn't even belch or refuse to take the whole shot every time! Now add in the washing machine wash and rinse water, the dishwasher waters, and don't forget to flush your toilets after each use by every member living there and that includes before or after you take that many gallon shower or basking in the filled bathtub. Might want to even wash your hands and who knows what else? God forbid if the kids would also turn on the water faucett and play in it for 15 minutes, maybe the whole neighborhood will soon be underwater!
Below is the accepted gov spec for septic tank size and daily water flow directly into it:
http://www.azdeq.gov/environ/water/permits/download/006.pdf
Read and learn!
Tank inputs per day are from a low of 450 gallons to way over 1000 gallons! That's not a one day gallon total input but an accepted gov everyday 24/7/365 gallon input spec!
OHHH! BTW 3 of our 4 septic systems we own have only ONE tank with one compartment and we know that as a fact as we had each of them originally installed and none have every failed yet! One had to have a pressurized system as the drain field is 12" higher than the septic tank inlet from the dwelling so it has a separate small tank next to the big septic tank with a sump lift pump with a float switch only to pressure flow the liquid to the higher drainfield.
Septic systems vary greatly from area to area and region to region. One size, type, or method doesn't fit all! Check with your local health department as to what works or is required in your locality.
Also, there are about 20 plus other charts that mirror the one I had linked! Is everyone else wrong and the few scarey posters on this thread right?