Kwazar Venus Pump Up Sprayer 2 Litre Foamer - Alkaline

I was initially disappointed as I kept on running into problems that led me to believe the pump sprayer wasn't any good (plus I had seen various comments on forums). But my opinion of this kit has changed since I've gotten to grips with it. It is a tall unit so you have to adapt to this when using low down on the car (e.g. tyres).
1) Initially I could only get a few seconds of foam before it needed pumping again. This was because air was escaping between the top and bottom, so you really need to screw it quite tightly. Now I can use it for quite some time before it needs to be pumped again.
2) If you're storing mixed down chemicals, consider using deionized water rather than tap water. I found with tap water it starts to clump up after a week or so, and it will clog up the filter in the nozzle assembly.