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Hello, the 4 inch sewer main, down stream of the toilet is beginning to clog up. The washer water full of lint etc makes the clog a little worse for a while then then sewer line finally drains completely.
The problem is usually roots from nearby trees or bushes growing through joiints in the 4" sewer line, the older the line is the more likely that is the case, especially 20 years or older.
Things like CLR, are only good for superficial water scale build ups.... in sewers the problem is mostly tree root issues, or grease and debris build up in the line. If you can find the clean out plug you can rent a 50 or 100" long snake and clean out the sewer line if the tree roots have not grown into too tough of a ball.... when that happens you need to call a 'roto rooter' type company that can run a snake with a root cutter head on it down the line.
You can also try this product for milder root growth problems
There is about an 70% chance that will solve the problem, for $12 a treatment it is surely worth a try.
We can go from here as needed.