If you are currently using an RV black tank, you have likely dealt with the same frustrations many RV owners experience:
dumping is inconvenient, odors are unpleasant, cleaning feels uncomfortable, and trips are sometimes planned around the next dump stop.
Because of these ongoing issues, many RV owners begin looking into Modiwell dry flush toilets as an alternative to traditional black tank systems.
But almost immediately, another concern arises:
“Modiwell dry flush toilet looks more convenient—but is the cost really worth it?”
The issues with black water tanks are quite clear, but the cost of dry flush toilets makes it difficult to make a decision. Below, we will compare the costs incurred during actual use for three options: A standard RV black water tank, the Modiwell dry flush toilet, and the Modiwell dry flush toilet and urine storage unit combination.
Why RV Black Tank Costs Are Often Underestimated?
When people compare RV toilet systems, most focus only on upfront expenses.
What is frequently overlooked are the recurring costs that accumulate over time.
In real-world use, RV black tank costs commonly include:
- Dump station fees or mobile pump-out services;
- Chemical treatments and deodorizing products;
- Water consumption;
- Cleaning and maintenance supplies;
- Time and effort spent dumping and cleanin;
- Occasional unexpected repair costs;
These repeated, incremental expenses form the true long-term cost of owning an RV black tank system;
RV Black Tank vs Modiwell Dry Flush Toilet: Monthly Cost & Usage Comparison
To make the comparison more intuitive and closer to real-world usage, we will analyze the costs and user experience of the Modiwell dry composting toilet versus traditional RV black water tanks, based on the premise of two people using them continuously for 30 days.
How to Further Reduce Dry Flush Toilet Costs: Using a Reusable Urine Tank
For many users switching from traditional flush toilets to dry flush toilets, the biggest concern is the cost of consumables. If each urination requires a new bag, the monthly expense can be a significant burden. However, by using a low-cost urine storage device for frequent urinations and reserving the dry flush toilet for when it's truly needed, your wallet will feel much lighter!
Below, we'll use a real-world scenario of two people using the system for 30 consecutive days as an example,
assuming each person has one bowel movement and four urinations per day, to illustrate the difference in consumable costs between the two methods.
Currently, the Modiwell dry flush toilet series that are compatible with Modiwell's reusable urine tank are the LE-310 and R1808 dry flush toilets.
