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Frequently Asked Questions
What does the lid actually do?
It closes the largest opening.
Everything that gets in comes through it.
Or through an unscreened pipe.
A resting lid admits insects and light.
A sealing one excludes both.
Is a sealed lid a requirement?
On a potable cistern, yes.
Not merely good practice.
And it is the detail most often wrong.
Lifted for an inspection years ago.
And never properly reseated.
Why does light matter?
Because algae need it to establish.
A translucent tank gives them plenty.
So does an ill-fitting lid.
Darkness stops the growth.
Rather than treating it afterwards.
How does the jacket earn its place in winter?
Delays freezing.
Which in a loft is decisive.
Between a working tank.
And a split one in February.
It buys time, it does not prevent.
And in summer?
Delays warming, which is forgotten.
A loft gets hot enough.
To move stored water into the range.
Where organisms multiply.
Insulation slows that too.
Does the lid need insulating as well?
Yes, and it is routinely skipped.
The top is a large single surface.
A jacket that stops at the rim.
Leaves most of the heat path open.
Which makes the rest largely pointless.
When are these usually lost?
After work on the tank.
Opened for cleaning or a repair.
And closed up carelessly.
A tank left worse than before.
Re-fit both properly, every time.