Worth just using a di only for first floor windows in hard water area?

[slippy]

Ok seems this guy selling pure water charges £10 for 400 litres and 200 litres for £7.50, sound better than just using a a DI? I wont need much water when starting out. Should I get the big boy backpack unit or use the trolley system? Fill up barrels on back seat?

 

[Smurf]

The advantage of using a trolley system you will not need to keep filling the backpack up but just swap the containers over instead. There is a post on here how to make a diy trolley very cheaply too :thumbsup:

 

[slippy]

Defintitely going to start to use wfp system. If I am doing it in a car, want to throw all this stuff on my back seat (which is covered with a plastic sheet. Isn't a backpack better for starting out? Are they heavy? I will get short poles, someone recommended phonenix poles as they are shorter and might fit on my backseat, good ones? What brush shall i get? TDS meter?