Keeping your indoor garden free from disease and pests should start with prevention. It is much easier to prevents insects and disease in your grow room than it is to get rid of them.
First and formost wash your hands before entering your grow room. It's also a good idea to wear fresh clothes. Never go straight into your indoor garden after working outdoors. If you do end up with pests or disease first identify the exact pest/problem that you have.
Once you know what you're dealing with then you can treat it. We carry many types/brands of disease and pest control for your indoor grow room.
Be sure to read the label. Even natural pest control is not always safe for humans and pets.