South East Water says some customers may temporarily lose supply as air pockets are flushed out.
Ms Duffield said she was "hounded" from the party because of her views on gender.
Rosie Duffield resigned the whip as a Labour MP in protest at some of the party's policies.
The Canterbury MP says she is leaving the party over the PM's "cruel" policies and "hypocrisy" at accepting gifts.
Lord Cashman criticised candidate Rosie Duffield for withdrawing from local hustings over safety fears.
Ms Duffield has previously faced death threats and abuse over her stance on sex and gender.
Representatives from all parties will outline their policies at Canterbury Christ Church University.
Glenn Mullen posted online death threats to the Harry Potter author and former MP Rosie Duffield.
Rosie Duffield says she now expects to be announced as the Labour candidate for Canterbury.
