Below is printed on the Benz site.
Btw: A word about sodium hypochlorite and pumps: Some companies claim that sodium hypochlorite (the active indredient in BENZ Blackwash) corrodes and damages pumps.
However, let's look at the facts about Blackwash, not progaganda and unfounded opinions (btw: Do not confuse Blackwash with commercial sodium hypochlorite, which has a 15% concentration of chlorine and so is very corrosive and dangerous):
◦At the very low levels (0.5-2%) of chlorine in Blackwash as applied to the surface being cleaned – a similar level to that used to sterilise babies bottles – the EU, Irish PCD, and UK HSE authorities class it as non-corrosive.
◦Simply by rinsing your pump and hoses at the end of a working day with fresh water (just feed through from a small tank or bucket for 30 seconds) we've found our pumps wear out through use, not from corrosion, because there is so much soft washing work to do. This is similar to rinsing salt water off fishing equipment to look after it after a day's sea fishing. A "Y" switch to quickly change from Blackwash to fresh water to clean pipes and pumps is neat addition that makes life easier, which is always a good thing.