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I always put it in via the bowl although this is not supposed to be the approved method !! Have had no lip seal problems and have had several cassette loos since they first came out.

I pump a little water into the open trapped bowl first and just carefully tip in about a cup full or less in cold weather and then flush the loo a couple of times to dilute the blue stuff (Elsan thick blue is the preferred one) 

Use the cap as a measure - as Scampi says. Take note of what it says on the side of the bottle as different makes have different quantities required. Add the amount to cassette having removed it from van compartment and add a litre or two of water (I use a bucket and a litre jug).

If using pink fragrancer, put it in the clean water tank access (on newer vans this may be a separate locked opening above the cassette locker, on slightly older vans its a fold-out filler cap inside the main cassette locker). Again use the amount stated on the bottle and top up (perhaps 6 to 10 litres depending on model) with clean water.

I like the Elsan chemicals too. They are very concentrated and a bottle gose much further than most other makes.

Job's a good un!

Jon

Now while I happily leave hubby to deal with all things loo related, apart from the washroom cleaning bits, I do know that the stuff we use have their own measure in the top bit where you just turn it upside down, (making sure the lids screwed on tightly of course - ooh, what a mess that could make), and when it goes back the other way, the measuring bit's all ready to go!

After seeing many threads raving how good that Fenwick biodegradeable stuff was on here, I did try to convince him that the would be worth giving it a go as it does both the waste and top tank all with the one liquid, but guess what he went and bought when the blue one ran out? Yep, more blue stuff!!! Although actually, come to think of it he did say this one was green! Wonder if that means it's environmentally friendly too? Did actually notice that the loo developed an odd pong at one point that we've never had before using the bog standard, (sorry for the pun), blue stuff! Coincindence? Btw, we do only use the cassette loo for 'number ones' of course! And hubby empties it regularly - once a year's right yeah? JOKING!!!! LOL