A part-used bottle of this product stored from last year rattled when shaken. There proved to be a crystalline sediment. Prolonged shaking will not get the crystals to redissolve, so obviously the diluted material from this bottle will be lacking in one or more of the essential components and therefore useless. The product has not at any time been stored below freezing point.
Will standing the bottle in hot water for a period solve the problem?
This may be a normal feature of your product, but if so, there should be a warning on the bottle giving a limit on the storage life.
I would appreciate your comments.