Nature-Kleen ozonator stone

Hi, I recently purchased a Nature-Kleen ozonator and have been using it for about a month every day. I no longer smell ozone much coming off of the water. Should the stone last longer, how long on average, and do you just get used to the ozone smell? I really don't want to pay $10 per stone/month :)

Also, anyone know where I can purchase some replacement stones and tubes for the model serial #NK-014298?

When you replace a stone do you try hard to wiggle it out or just cut that tip off?

Thanks!
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