WCW good, I am sending mine back as its failed, no idea why.....
Apart from that I bought about 10 metres of tubing,some hose connectors and crimp able metal o rings , cut original hose,inserted new one and it's brill,
Just leave on a landing, it's long enough to do 4 beds without moving it.
I am going to order more tubing, start with converting my unit to 15 metres, if it's too messy, I will then reduce to 10 metres.
I removed straps , dodgy using on back, if you catch on architraves or knock a picture off the wall.....
plus 18 litre is 18 kg....
I work out before I go to job what I need, and fill unit before I leave.
Also, if you use a TM, saves on a little fuel you would use if using an in line sparayer, plus time running down to turn off TM whilst agitating in pre spray.
Just my thoughts.....
Been using in line sprayer whilst I send mine back, been ok, but I do like the back pack.
Mr B