Hint: When you get your bottles, use one immediately and then write the month and dates of the 4 consecutive years on the other 4. This will be a good reminder for when the bed needs topping up.
Long Life Akva Waterbed Conditioner is an effective agent against bacterial formation that keeps the water in the mattress clean. Just add the conditioner to your waterbed mattress once a year and the conditioners' special properties look after the rest. That's 380ml /12oz of conditioner fluid not 236ml or 8oz like most other conditioners.
Mike Ayres Design only uses AKVA Waterbeds.
Manufactured by AKVA waterbeds in Denmark (they make probably the best waterbeds in Europe) and their mattress warranty requires the annual addition of this conditioner. AKVA require AKVA Long life conditioner to be used for their 5 year warranty. Any other conditioner is not acceptable.