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Discussion Starter · #1 ·
This might be a dumb question.... Do you turn your canister filter off when you do a water change? I always unplugged my HOB's during water changes, but someone told me you should NEVER turn off a canister except when you clean it.... Something about anaerobic shock (whatever that is).
 

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I turn mine off every time for water changes (once a week). Always have. Never an issue. Never heard not to turn it off...

I also close in and outflows so it's not like the canister fills with air. It just holds the water for maybe 20 minutes with no flow.
 

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I tuen off all filters lights and heaters when doing water changes. Never had an issue.

Sent from my SGH-T889 using Tapatalk
 
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