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We use the Kirkland brand also. Didn't know it was septic safe however. I don't think it really matters what brand you use as long as you put lots of water in the tank after you have drained it. We always put down 3 full bowls of water. Works for us and we dry camp for 4 months in Quartzsite every winter.
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Lenny and Ros
2012 Montana 3400RL,680 Watts Solar,4xT-105 Trojans,GP-ISW2000-12 Inverter,Trimetric 2020, EMSHW50C
2009 Chevy Silverado 3500 LTZ Duramax 4x4 CC Dually, Banks Speed Brake
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