This sounds like a classic case of the drainfield failure. The field is saturated and when water is added, it cannot exit the system and is stored in the pipes and septic tank head until it can work its way to the surface and be absorbed by the grass or evaporate. The treatment for this is to pump the tank and allow all of the water to drain back into the tank from the field and distribution box. Then either pump the field directly through a posthole dug into the stone or if there is some drainage, wait as long as possible between pumping the tank and adding the Septic-Scrub. he directions are given on this WEB site. If you have any questions, please do not hesitate to call.