I purchased their 600 External Filter - the concept was an easy sale, namely that the heater was in the filter and therefore no need to have one in the Aquarium. I started to notice that the temperature was not holding and realized it was because the filter kept filling with air - something I am told it a common issue with these filters. I bought a heater (defeating the object!) and temperature were OK - I had another filter running in tandom - then I realised there was virtually no flow whatsoever, upon inspection the heater had broken and no matter what I tried it would release the air. Being under a 3 year + 1 Warranty, I assumed there would be no problems in returning this item as not being fit for purpose, especially as had the heater been plugged in, I would have had an electric shock - I am awaiting the outcome, but I would suggest that the product ins't fit for purpose.
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