The Thetford Aqua Kem Blue Lavender Concentrate is a highly effective toilet fluid for the waste-holding tank, that offers the best performance for your cassette toilet or portable toilet. Blue Lavender has the powerful effect of the familiar Aqua Ken Blue Concentrate combined with the fresh smell of lavender. Compared to the original Aqua Kem Blue, this concentrated fluid has improved liquefication for easier tank emptying and stronger reduction of gas build-up. The odour control performance of Aqua Kem Blue Concentrated products is at the same outstanding level as the original product range. More concentrated, a single dose lasts up to 5 days with a 780mL bottle offering up to 13 dosages for 65 days of use.