having worked in the vsewage industry i would say dont use either . both arent good for sewage systems .

The Thetford Porta Potti 565p offers a comfortable, home-like toilet shape that doesn’t need a drainage connection. This portable toilet has an integrated flush water tank and waste holding tank, making it easy to transport. With its comfortable seating height and bigger toilet bowl, this design is the next best thing to your toilet at home. Waste and water products from Halfords Thetford Toilet Chemicals Thetford Aquakem sachets, 15 Aquakem sachets in a childproof container. Pleasantly pine scented. Thetford Aquakem Green Toilet Fluid 1.5 Litre stimulates biological activity in your waste tank. Micro-organisms biologically break down the toilet waste in the tank. The camping shop turned out to be a Camping Car accessory store, they had a bewildering display of Thetford Chem’s, but what caught my eye was the Thetford Aqua Blue “CONCENTRATE” now this stuff came out of the 750ml bottle like treacle and 60ml was all you needed for a 15lt cassette like ours. Small and powerful! The Thetford Aquakem Blue Lavender concentrate is a powerful, highly effective, 2.5 times concentrated toilet fluid for the waste-holding tank of your Cassette and portable toilet. Comparing Aqua Kem Blue Lavender Concentrated to the original Aqua Kem Blue, several product aspects have been significantly improved. Two of the key changes are the improved liquefication for easier tank emptying and the stronger reduction of gas build-up. Thetford has also kept familiar features from the original Aqua Kem Blue such as the number of dosages and the universally loved fragrances. The odour control performance of Aqua Kem Blue Concentrated products is at the same outstanding level as the original product range. A 0.78L bottle of Aqua Kem Blue Concentrated offers up to 13 dosages for 65 days of use, the same as a 2L bottle of Aqua Kem Blue. This means the new Concentrated product range will deliver more power per drop in comparison with the original Aqua Kem Blue. After returning to caravanning with a ten year gap between our last caravan and this one, we could not find any Elsan blue in our local camping shop so opted for the thetford stuff instead. to be honest we found it quite 'watered down'in its actions compared with our old Elsan fluids we always used before.if you stop washing it out its amazing after a couple of fills you should find it doesnt smell and tips easy.

Want to save yourself some weight and space? Which caravan or motorhome owner doesn’t? Well with the new Thetford Aqua Concentrate range, you can have exactly the same amount of top quality toilet fluid whilst saving yourself those two precious things. The principle toilet chemical goes into the unit’s waste tank. These chemicals come in various forms. The traditional type is often a fluid, which needs water to dilute it. It’s normally more expensive to buy chemicals in tablet form.Delivery is 3-5 working days as standard from dispatch. Processing and dispatch may take 1 working day. To connect water for you to use, you need a reliable caravan water pipe or hose. Choose between a great range of brands at Halfords, such as Truma and W4. Once you're done using your Aqua Roll or Wastemaster, you can safely store the equipment in our helpful Olpro storage bags until your next trip. Caravan toilet system