How do I remove plastic compression coupling to access external waste pipe?

[rpm]

Rodding points can go on every bend, install a 't' with the blind part a threaded removable stop end. centralheatking

Putting rodding T on every bend is an overkill.

Luckily there is a slight angle to our house in the direction of the soil pipe. I did ask about the need for more fall, but installer said pump in our saniflo is so powerful so not an issue. After flushing I can hear water washing around in the loft pipes for around 30 secs before it goes through to external run and into main soil pipe, so working fine now.

Anything over a few seconds is wrong.

Too many fittings there.

How would you do it?