im very happy with my system.
500l upright tank and frame £500(including fitting at my local garage)
streamline pumpbox with digital flow controller(£300)
2 reels and hose(£350)
2 DI vessels(£150)
so around £1300
ive spent a lot more money on hi modulus carbon poles and brushes than my actual system(around £2500)over the last few years.
each to their own but i dont see the point of spending a lot on a tank when its being fitted in a used van that i will probably only have for 4 or 5 years.
im DI only though so that helps with ease of purifying my water in mega quick time every evening.
ive also spent money on a boiler,hot water hose,gas etc,etc but decided i wont be using hot water anymore as it simply isnt needed and its extra expense that i can do without.