Can I recommend detergent? The house where we previously lived was 1/2 block from the main sewer line and the drop between the house and that line was not very steep. After several times of having to clean the line and finding it was caked detergent, I started using Arm and Hammer's powder (not the liquid). No more clogged sewer! It is a low-sudser and does a wonderful job of keeping clothes white. I've used this detergent for LOTS of years and still happy with it.