Please note that we will not ship this product to WA, SA, NT or TAS without giving you a freight quote as we cant send this with Australia Post. Freight for this product to Vic, NSW, QLD and ACT is included to within the town limits only, pick up from the depot is available, if in doubt please call and we will confirm. Making tank water safe to drink is now a simple and easy for everyone to carry out. Water tanks on your house, water tanks under your caravan, in your boat, in the motor home, in the camper trailer or just on the 4 wheel drive can now have safe clean water. An Australian Made product "HydroSil" and "TankSafe" are the perfect starting point for clean water, add a filter or two and what you will end up with is clean bacteria free and dirt free drinking water without taste or odour and without using any chlorine.