5in. Imperial SuperSterasyl candles with ATC.

We purchased one of your Aquacrock water chillers some years back. We noticed that our last shipment of replacement candles are about half an inch Shorter than the prior versions of your 6" Imperial SuperSterasyl candles. Is there any reason for this, and will this necessarily affect the performance or durability of their filtering if they're now Shorter than the prior versions?

 The ceramic filters for the AquaCrock used to be 6 in. This was the case up until about 2007 when the manufacturer designed it as a 5 in. replacement candle element which has Lead Reduction capability. Each of these ceramics have a 500 gallon capacity (1,500 gallons when using three).