Unison believes 80% of its 500 members took part in the latest strike by home carers and care home staff between Thursday and Sunday. They are protesting about the new contracts - which cut weekend pay.
The council has offered to compensate staff for one year's loss of weekend pay, but Josee Ford, Unison convenor, said some staff had discovered that the council's estimate of their losses was much lower than their own.
She said: 'The second strike was a success and our members have been even more incensed since they received details of the compensation. People who are losing£800, for example, are only being compensated for£200. This is strengthening our resolve.'