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Frequently Asked Questions
What makes a cistern potable?
Approval, not appearance.
Materials certified for drinking contact.
In the market where it is installed.
Plus sealing, screening and a regime.
It is a regulated component.
Would a non-approved tank look different?
Not at all, and that is the danger.
The water looks identical.
What differs is what leaches into it.
At levels that matter for drinking.
And nothing announces it.
Which opening is most often neglected?
The overflow, by a distance.
An unscreened one is an open pipe.
From outside into the stored water.
It is the commonest contamination route.
And the easiest to put right.
Why do darkness and coolness matter?
Because light and warmth drive growth.
Algae need light to establish.
And warmth accelerates everything.
An opaque insulated tank out of the sun.
Is doing real work, not looking tidy.
How is turnover designed in?
By where the inlet and outlet sit.
So water crosses the tank.
Rather than circulating in one corner.
While a dead volume sits untouched.
Position matters, not just size.
Is a larger cistern safer?
The opposite, usually.
More volume means longer residence.
Which is time for things to grow.
Size it to demand, not to caution.
Generosity is a risk here.
How often should it be opened?
On a schedule, and it rarely is.
Inspection and cleaning at intervals.
A cistern unopened for ten years.
Is not a maintained store.
Whatever it was when installed.