Hi! I'm new to the site and just wanted to say hi! My husband and I bought a house recently, it's on septic tank, which was just pumped a couple of years ago, we replaced the toilet in the guest bathroom and left the old one in our bathroom, so 1 brand new toilet, and 1 pretty old toilet haha, anyway, when either toilet is flushed you must flush your #2 first, then flush your toilet paper next, and possibly keep flushing until it's all gone, anyway once it's gone the water level is VERY low and after a couple of hours finally reaches full height, again this happens with BOTH old and new toilet. Water pressure is fine everywhere else (sinks, hose, etc.)

How fast does the toilet tank(not bowl) refill? Do you have any other drainage issues in the house. If your on a septic system, them I'm assuming you are also on a private well. How is the quality of your water? You may have to clean the toilet rim holes and jet hole, and may also have to clean or replace fill vavle. But lets take this one step at a time. Please keep me posted.