A round fibreglass tank is proposed to store both potable water and water for fire protection purposes for a healthcare facility. The top two-thirds are being used for potable water and connected to the potable water pumps while the bottom third is used to store water for fire protection and connected to the fire pumps. The potable water is pumped through sand filters before being distributed.
Is this safe? How do we prevent the potable water from being contaminated from the fire water which would be sitting for long periods of time? Is there any code, standard or guideline that can provide some guidance in this matter?