Top 10 Best Seller – Fresh Start – Tap water contains chemicals (chlorine & heavy metals) that are harmful to fish and water borne wildlife. Fresh Start should be used when ponds are first filled up and whenever a pond is topped up with tap water, to make the water safe. The treatment also contains a protective aloe vera colloid to protect the delicate skin membranes of fish and amphibians. Size 250ml – treats 500 gallons/2,273 litres