This happened to me too

- spent the last month taking good care of it and making sure it was warm and then through bad luck had to leave in the van for a day and the membrane is now cracked.
I filled up from an outside tap and it used to be very slow - like 6-8 hours to fill up a 250 litre tank. Pressure seemed alright but the merlin would probably shoot out 80/90% waste and only trickle the remaining 10% in too the tank.
Now going to change to an indoor system - with an indoor connector. Think the pressure will be less but if I get a 4040 unit - will the 500 litres per hour that its advertised be realistic to achieve - how does it do it - by filtering more water so waste is a lot less.
Also will carbon filters before the 4040 or a merlin 720 improve the water production rate (as well as keep membranes safe?)
Any opinions much appreciated,
Thank you,
Rob