Mr Koizumi GH/KH Plus is a powdered pond water treatment for koi ponds and ornamental ponds. Available in 2.5kg and 5kg pack sizes, it is intended for pond keepers who monitor and manage water parameters as part of their routine pond care.Use with regular water testing so you can make informed adjustments. Always follow the product label for dosing and application guidance.Key Benefits Powdered pond treatment for GH/KH support Available in 2.5kg and 5kg pack sizes Suitable for koi ponds and ornamental ponds Best used alongside regular water testing Who's This Product For?GH/KH Plus is for pond owners who actively test and manage pond water parameters for koi health and water stability.Available Sizes Size SKU 2.5kg MD612 5kg (2 x 2.5kg) MD613 FAQShould I test the pond water before use?Yes. Products affecting GH/KH should be used alongside water testing and according to the label instructions.What sizes are available?This product is available in 2.5kg and 5kg pack sizes.