Tammyle

Hello Cecil, We're currently living in a N1 period 7 house, we have a 20,000 litres of rain water tank 3x3m in our south east. We are thinking of renovating our house to better accomodate our needs and bring it to a N1 period 8 house. Is it ok to have the water tank there? We have been using it intensively for 2 years to water our big garden. If harmful what can be done ? Thank you very much for your help. Kind Regards, Ms Thoa Le