Matter of preference. On our old unit, replaced the low aqua magic with the high dometic 320 which we like better. Which ever works best for you. Guess we like the high because that is what we have in the house. We do think the dometic,whether high or low is a better choice than thetford because of the flushing mechanism.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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