It almost sounds like they extended the shower drain into the tank too far, so once the level reaches that point it doesn't vent properly & either drains slowly or backs up. I'm positive they did that with the roof vent line on my grey tank, it drains very slow at first then it gurgles & drains quickly.
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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