I know this may sound gross, but it has been a wonderful addition to our outdoor sewer needs.  (Just don’t stare at it, cuz, yuck!)  Anyways, this is especially helpful when doing your tank cleaning.  It allows you to see the clear water and let you know that your tank has actually flushed out and is as clean as it’s going to get.  We went without it for several camping trips and Dave went and got one and is very happy to know our sewer is now in the ‘Pink’, rather than then the…., well, you know!