Water filtration system

[tamada]

We have a couple of 1 m x 10 m surface standing, concrete well-pipe water storage tanks connected to the city water and ahead of the pressurized house water supply system. The natural settling of muck and sediments in these tanks before it is drawn into the house has coped for the past dozen years but the past month or so, the city water has been really murky and now the service point filters on the pressurized side are getting really dirty really fast.

So looking for a one-size-fits-all external water filtration system I can insert in the water main between the meter and the storage tanks. Nothing too high tech and something large enough that won't need too frequent backwashing and the like. If like in previous homes, the dirty water is a temporary thing due to them working on the water mains somewhere, then all well and good but nice to get something installed in case it's a bigger issue with dirtier water in the long run.

I note that the main supply between the meter and the tank has been run with the same 1/2" blue pvc piping that the whole house is plumbed with. Any value in increasing the inlet pipe diameter to 3/4"? Since the existing inlet pipework is old, faded and over 12 years old I may replace it but with city water pressures being typically low in our area, since the 10 m tanks are top-filling, maybe the bigger pipe will mean bigger tank refilling issues?

Names, brands, prices, pictures, ideas, etc., all welcome.

ta
tam