I have been using Thetford's Aquakem blue liquid for years. I see now they produce Aqua Kem sachets. Has anybody tried these and are they as effective as the liquid, which is not as good as it used to be. The thing I like about the liquid is I can vary the dose if the weather is really hot, with sachets you can't inless you put two in. Just looking at ways to lighten the load and make life a bit easier and cleaner.