He recommends the product

A traditionally high-quality product, but the absence of the Aqua Rinse and Aque Kem "starter" refills, which were part of the delivery for older models, is sorely missed. Bottles for "starter" refills have a storage space in the lower part of the toilet (even in the new model 335), so they were also great for secondary "reserve" refills for longer-term caravanning events. In this way, spare refills must be carried separately outside the toilet, and the user thus has two more things to "not forget".

Pros: Since I needed a toilet of the smallest possible dimensions for a camper for caravanning, I decided on the newest and smallest model 335. In the past, I already had a similar toilet from the same manufacturer, and it served perfectly for many years and continues to serve at the cottage. It does not fit in the camper due to its larger dimensions.

Cons: Thetford Porta Potti always has a "Storage for toilet fluids" storage space in the lower part for two smaller square plastic bottles as "backup" fillings for the upper and lower parts of the toilet, so that the user does not have to carry two additional bottles with these fillings separately . Model 335 has also created this space, but it was surprisingly empty. Even in the attached materials, it is not stated that spare refills (or so-called "starter" refills) are part of the delivery. So the manufacturer inexplicably didn't put them there. Does it create room for competition to use cartridges from other manufacturers? More than the missing starter filling (Aqua RInse and Aqua Kem), one regrets that there is no chance to find plastic bottles of the given dimensions, and they are not even in the manufacturer's offer. So, instead of one thing, the interested party has to carry three (the toilet itself and two bottles with refills). If he should have it stationary, e.g. somewhere in the cottage, there is no problem, but e.g. when caravaning, every thing in the camper "counts". It is therefore possible to advise those interested in Thetford Porta Potti to prefer buying older models, which are also a third cheaper. There maybe "starter" or reserve refills will be part of the delivery.