NT Labs Koi Care GH Minerals Up, Increases General Hardness of Pond Water, Maintains Pond Water Quality, Provides the Optimal Habitat for Your Fish and Other Pond Life, 5kg

A good service and a good quality product which corrected my garden pond water hardness in a very short time.

Really good. Doesn't cloud the water like some gh buffers do and excellent value

This has helped me keep my Koi and other pond fish healthy and fit

Started Killing in aquarium in in the same day, definitely bad batch, was using this product for years without any problems. Ingridients must be written on the label

Great product. Changed gh level to normal within seconds. Arrived quickly.

Used the whole bag over 3 weeks, fish seem happier and my GH levels look about right now.

Does the job and I like the look and feel of the resealable packaging used by NT Labs

A good product, but had no difference in working than products far less expensive