Replacing Water tank in loft

[Wiseflower]

Hello,
Is it worth replacing the old tank with a new water tank in the loft?
The tank is plastic without a loose lid. It is old, at least 40 years old. I noticed debris in the water at the bottom. Although the water comes out clean, it is not a nice thought that I use water from this tank for washing and brushing teeth.
We already have a new boiler system so a combi-boiler is out of the question and thought it might be worth replacing the water tank.
Will it also increase the value of the house?

Watching with interest!! grateful for any advice on this too.

I had a new tank and a lid made when we rented the house out, as there was a legionella test we would have failed otherwise.

Do you definitely still need a tank? The last two houses I've lived in they have been removed and the house just fed by mains water.

Are you sure the tank feeds the cold taps?

Quite often (I think in all of the houses I have lived in) the cold taps are fed from the main incomer which then fills the tank in the loft i.e. after supplying the taps.

The loft tank is for keeping the hot water cylinder and central heating topped up.

You could always drain the tank down and remove the silt.

If you get a new tank you will have some silt accumulate over the years.

The water tank must about 1970's/80's and old plastic. It stores the cold water for baths and feeds the hot water cyclinder downstairs. Yes, we do need to have a cold water tank.

Thank you Thegcatsmother. I never thought of the Legionella test ! It would make sense.

It is a loft cold water tank that feeds the cylinder in the second bedroom for the boiler and central heating and hot water needed for bath.
In the bathroom, the cold water comes from the cold water tank in the loft and not the mains.

In the kitchen and ground floor toilet, the cold water comes direct from the mains.