Aquablanc A Combination Liquid 1L FeaturesAquablanc Combination A liquid is part of a non-chlorine active oxygen system used in conjunction with the Aquablanc O2 tablets. This dual-action treatment provides non-chlorine disinfection of your hot tub whilst promoting soft, gentle water. This active O2 System requires a weekly dose (or weekly top up) with A Combination Liquid combined with O2 Tablets dosing via appropriate floating dispenser prior to bathing (or otherwise weekly). InformationInitial: 60ml Aquablanc A Liquid per 1,500 litres of spa water.Weekly: 15ml Aquablanc A Liquid per 1,500 litres of spa water. Aquablanc A Combination Liquid can be added directly into the spa with the pump on Links Aquablanc Active Oxygen Tablets 1kg Blue Horizons 3 Way Oxygen Test Strips