aeration , causes , remedies

[Ted808]

Recently went to house for CP12- and I had a while you are here could you look at....

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the cold supply to the bathroom upstairs, ( HWC / airing cub and CWSC / loft ) has no pressure - sure enough the water trickled out. So I went into the loft - tank full + ball valve working.
Mixer taps in bathroom and all pipework boxed in good n proper. mmm scratch scratch ...
ok disconnected cold supply to CWSC and temp connected to cold supplying bathroom,
( basin bath + loo ...) water on NO PROBLEM so no blockage.
Reconnect and same problem no flow.
Then made a permanent connection, cold now on mains pressure. Super as shower is electric anyway.
After this I wanted to know why and how come, so I asked around.
Then someone told me about aeration. This is when - correct me if I'm wrong - a ball valve - likely loo, no longer seals when 'off ' and air is sucked in, making the flow low? or creating an air lock...
My questions: r this - if this is the case should I go back to the property and change the wc ball valve washer , will it affect the water now that the cold is on mains- i.e. is this a bad thing? AND how can you test if it aeration happening - for future ref ..
never heard of this before so am puzzled and for any one shedding light ...
you are a diamond!! :devilish:

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[Ted808]

no one heard of this ffffnnomina ?
no one?
REALLY?

 

[Howsie]

-ve could cause air to come in from a number of places. Fit a deaerator and go down the VDI 2035 route if it suits you.