Phosguard instead of GFO

Fire extinguisher and brakes are regulated or independently tested but outside agencies. Phosgruad is more like supplemental we tank are Not regulated by the government
It's kind of like saying abbot viagra works so Gnc love doctor pill must also work but Abbott needed to prove this pill to the FDA gnc didn't

But I will agree I have used both in my tank with great results but I also change mine out every 2 weeks to a month. Once I test and my phosphates go up I change it out


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Wait...are you saying the GNC "Love Doctor" pill doesn't work?!
 
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