A few questions about carbon GAC

five.five-six

Well-known member
I came home last night and the tank smelled fishy. normally that just means I haven’t cleaned the skimmer in 2 weeks and my SOP is to clean the skimmer and run GFO for a few days before my better half starts complaining about the smell. Well 2 things. I ran out of carbon. I’ve been using Marinland black diamond for a long time with good results but was wondering if there was something else with high quality that might be a better value.


The other thing is that I took a quick ORP hit and then it started rising when I put the GAC reactor online and that is normal. What was different is that at 3:00AM the ORP took a digger and set off the audible alarm. I turned on the lights and everything looked great, massive PE on the SPS and the fish all seemed a bit groggy but otherwise fine. I closed the feed valve to the GAC reactor and ORP recovered rapidly

any ideas what’s up?

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I’m starting to think it’s my ORP probe, it think it’s about 5 years old but everything looks great but my ORP is doing this:

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I use 2 ORP probes and generally have to replace them every 1.5-2 years.

Have you ever cleaned it?
 
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