Fernox MB1 or F1 - What's the difference ?

[bigzed]

Hi, could anybody tell me please what is the difference between these two products ? I'm going to run my system for a week or so with F3 Cleanser to get rid of any of the soldering residues and then flush, drain and refill with one of these inhibitors but I can't seem to see if there is any difference between the two.

If anybody could point me in the right direction, I would appreciate it. TIA

 

[Boilerman2]

MB1 comes in 4Ltr pack to dose a typical 3 bed house, F1 is sold in 500ml to do the same job i'd go for F1 if only cos it is easirer to get in especially on sealed systems

 

[bigzed]

Thanks Boilerman, I'll go for the F1 then. I only have a 2-up 2-down terrace with 6 rads anyway so 500ml should be easily enough if it's normally OK for a 3-bed semi.

 

[bengasman]

Drain and refill the system as many times as it takes to get the water clean; no point treating it with cleaner if you don't get all the crap out. Run the system for 5 minutes every time you fill it to make sure there are no pockets where the dirty water just stays put.