It is common for hair to block shower/bath plugholes. Please ensure this is checked on a regular basis and cleared out to prevent blockages further down the pipe.
Kitchen sinks can also become blocked if food waste is washed down the sink.
By emptying left over food in the bin, before washing the dishes and/or putting them in the dishwasher, this can also help prevent blockages.
Please also take care if you are using cooking oils etc. Oils should not be poured down the sink. Please dispose of this in a container, in the bin.
We do recommend all tenants to purchase a sink strainer to help reduce the chances of blockages.
I have attached a link above. These strainers are also available widely in supermarkets and other retail stores.