Nan Posted September 22 Share Posted September 22 Is there any way to combine the black tank with the grey tank? I have a composting toilet and could really use the extra storage the black tank could provide. Thank you. 1 Link to comment Share on other sites More sharing options...
Ronbrink Posted September 23 Share Posted September 23 I have no first hand knowledge of this, but the question has been raised before; hopefully someone will come forward with an affirmative answer. 2020 OLEll, Twin, 579: No installed solar, Renogy 40A DC-DC charger, 460Ah LFP battery bank/Victron SmartShunt, Hughes Autoformer, dual Lagun tables, auxiliary Cerbo-S GX/Victron 30A Blue Smart IP22 Charger combo, Dreiha Atmos 4.4 a/c upgrade. 2019 GMC Savana 2500 Cargo Van: 6.0L V8 Vortec, 6-Speed Automatic; Explorer Limited SE, Low-Top 7 Passenger van conversion, RWD. Link to comment Share on other sites More sharing options...
Moderators mossemi Posted September 23 Moderators Share Posted September 23 Here is NCeagle's process to accomplish this task! https://olivertraveltrailers.com/forums/topic/5345-easy-way-to-repurpose-an-unused-black-tank-for-grey-water/ Mossey Mike and Krunch Lutz, FL 2017 LEII #193 “the dog house” Link to comment Share on other sites More sharing options...
rich.dev Posted September 23 Share Posted September 23 @Nan yes this question has been raised by many (including myself) before. In most RVs, the grey and black water tanks are separated but come together to flow through the same opening when it comes time to dump the tanks. So something as simple as adding THIS valve will allow the black and grey water tanks to be connected and for liquid to flow between the 2 tanks. However, with the Oliver valve configuration I don't believe that would be a possible option, unlesss you add one of those valterra blade valves right at the outlet. But also, if I remember correctly the grey water tank sits slightly lower than the black tank so that could be an issue as well (water going "uphill" from grey to black). Anyway, here are some threads with good reading material and possible solution for you.... Please let us know if you come up with another solution, I would be interested as well. 2023 Elite II, Hull# 1386, Lithium Platinum Package (640AH, 400W Roof Solar, 3000W Xantrex Inverter), added 400W Renogy Solar suitcase with Victron MPPT 100/30 CC, Truma water heater & AC TV: 2024 Silverado 2500HD 6.6L 10-Speed Allison Link to comment Share on other sites More sharing options...
2008RN Posted September 23 Share Posted September 23 I use a 12volt pump, kind of cheap and manual, but I hook it to the output for dumping, and then connect to the spray port on the black tank. I do have a fine mesh filter on the pump so no debree gets stuck in the sprayers. I have used it when we are boondocking greater than 4 days. 1 2 Early 1999 Ford F250 SD 7.3L Diesel 2020 Elite II Twin - Hull # 648 Link to comment Share on other sites More sharing options...
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