I have a customer who I had snaked the drain on the 4th of December and it has plugged up again. The house in on a slab on grade. I told the owner that the cast iron drain is restricted and I was unable to get a cutter down the drain more that 30' the drain is scaled up and reduced in size. I mentioned that if it clogged up again I would recommend to try and descale it. I gave him a price to descale for 4 hours. The owner texted me yesterday and said the property was stopped up again and asked for a solution to fix the problem. I told the owner that the best idea was to saw cut the bathrooms, kitchen, and laundry room and run the new sewer through the home under or through the footing and out into the septic tank. He asked for an estimate I said thousands of dollars. The owner said he knew he would need to replace the drains in the future but lets try descaling this time. To be honest I have not tried descaling a sewer before, just watched a lot of YouTube videos and advice on plumbing forums.