Descaled sewer from clean out in basement back towards first floor bath/ upstairs stack, also pulled toilet on first floor and descaled branch line over to main 4” line we descaled from basement clean out. Removed all loose scale from line and tvd line was clear. 4” cast Pipe holds about 1” of water recommend holding handle on all toilets (all 3 are Toto) for full flush with any paper to allow more water to carry paper and waste through line. If problems still occur highly recommend replacing at least downstairs toilet to gerber avalanche toilet for a better flush.