Why won't you pressurize?!

Putting this thing together was rather frustrating - I was pumping it up and it would not hold pressure.

Anyway, found the problem in the end - tipped it upside down and water came out the top (hence the water on the floor), took the pump part out and found the problem. Fixed & all good now.

Weeds, you have met your maker - just as soon as it stops raining for long enough.