Setting up a portable RV water softener means identifying the exact model and manual revision, connecting it in its documented sequence, flushing it to a protected discharge point, checking for leaks, and testing treated-water hardness before continued use. Do not begin until you know which model you have and can follow its manual.
If you have not chosen a unit yet, use a buying comparison to choose a portable RV water softener first. This guide covers only the models and manual revisions identified below; it does not cover regeneration, storage restarts, sanitizing, or universal pressure settings.
Which Portable Softener Models Does This Setup Cover?
This guide covers On The Go Standard, Double Standard, and Park Model units for a new-unit first hookup, plus the PRO+AQUA WS-P-16 in manual Version 2.0 082823. It does not cover a post-storage restart for an On The Go unit.
| Model branch | Manual basis | Setup condition | First-flush basis |
|---|---|---|---|
| On The Go Standard | On The Go first-time hookup instructions; On The Go Manual 2020 | New-unit first hookup | 2 to 3 minutes |
| On The Go Double Standard | On The Go first-time hookup instructions; On The Go Manual 2020 | New-unit first hookup | 4 to 6 minutes |
| On The Go Park Model | On The Go first-time hookup instructions; On The Go Manual 2020 | New-unit first hookup | 7 to 9 minutes |
| PRO+AQUA WS-P-16 | WS-P-16 User Manual, Version 2.0 082823 | Initial reverse preflush, then normal service | 5 minutes, until water flows clear |
A new On The Go softener does not require salt or regeneration before first use. That instruction applies to a new unit, not to restarting a unit after storage.
What You Need Before Connecting Water
Before turning on water, confirm the model and manual, use a supply with no known contamination, plan a protected discharge route, match hoses and fittings to the marked ports, resolve pressure protection from your own manuals, and have a hardness test method.
| Need | What to confirm | Evidence basis |
|---|---|---|
| Model and manual | The exact model label and the matching manual revision | On The Go first-time hookup instructions; WS-P-16 Version 2.0 082823 |
| Water source | A supply with no known contamination or concern about color, taste, or odor | Minnesota Department of Health guidance says to remove contamination sources or use a safer supply first. |
| Discharge route | A permitted place for flush water to go, with no direct connection to a plumbing drain or sewer | Public-health guidance identifies incorrect discharge placement as a cross-connection hazard. |
| Hoses and fittings | Connections that match the marked IN and OUT ports and the parts actually supplied | The WS-P-16 manual lists its supplied connection components; confirm your actual package. |
| Pressure protection | Requirements from your softener, pressure regulator, and RV manuals | This guide supplies no universal PSI, flow rate, regulator position, or regulator setting. |
| Hardness check | A hardness test kit or an independent laboratory test | Public-health guidance identifies these as ways to measure hardness. |
For a WS-P-16, the manufacturer highly recommends an upstream CTO prefilter, such as its WS-P-REG-KIT, to protect the softener. Any filter, hose, regulator, or RV accessory you add needs to be checked against its own current manual.
Safety and Stop Conditions Before You Start
Stop before connecting water if the unit or its parts are unidentified, damaged, or cracked; if the supply is known to be contaminated or concerning; if the discharge would connect to a plumbing drain or sewer; or if a pressure or fitting requirement remains unresolved.
- Do not proceed with a WS-P-16 installation if any part is cracked or damaged. The manufacturer says to contact PRO+AQUA for an exchange or diagnosis.
- Do not connect the flush discharge directly to a plumbing drain, floor drain, or sanitary sewer. Public-health guidance identifies those arrangements as incorrect because they can create a cross connection between potable water and the sewer.
- If you use a drain receptor, follow the applicable local air-gap and disposal requirements. This guide does not provide a universal air-gap dimension or assume permission for any particular campsite discharge location.
- Do not treat a backwash adapter as backflow protection.
- Do not use a softener as a substitute for addressing a known contaminated water supply.
What Is the Hookup Order for a Portable Softener?
The hookup order depends on the model. On The Go units use source water at IN, flush before connecting OUT, then send treated water from OUT to the point of application. The WS-P-16 uses incoming water at IN and sends water from OUT to the RV city-water inlet after its initial reverse preflush.
| Model branch | Supply connection | First flush | Service outlet | RV destination |
|---|---|---|---|---|
| On The Go Standard, Double Standard, or Park Model | Source water to IN | Flush to a protected discharge point before connecting OUT | OUT to the point of application after the flush | Follow your RV manual and inlet labeling |
| PRO+AQUA WS-P-16 | Incoming water to IN after the reverse preflush | Feed OUT and discharge at IN for the initial preflush | Secondary hose from OUT | RV City Water Connection or City Fill inlet |
A sediment prefilter can help protect softener resin when the water supply is cloudy, because mud and clay can clog resin. That is a conditional rationale, not a universal treatment order for every RV setup. To understand where softening and filtration fit in a water system, see how water softeners and filters work together.
Setup Steps Shared by Every Supported Model
Complete these shared gates before using the model-specific flush instructions below.
- Confirm the model and manual. Match the unit label to one supported manual branch. Stop if the model is unidentified or the manual revision is unknown.
- Set up the discharge route. Choose a permitted discharge area with no direct potable-to-sewer connection. If you use a drain receptor, apply the applicable air-gap protection. Stop if the only available destination is a direct sewer insertion, submerged hose, or unapproved disposal point.
- Place the unit upright. On The Go instructions say to make sure the unit is standing upright for use. The WS-P-16 manual likewise says the unit must be installed upright and never on its side.
- Confirm inlet-pressure protection. Before connecting the supply, check the pressure requirements in your softener, pressure regulator, and RV manuals. This article does not supply a universal pressure setting, regulator placement, or regulator setting. If you need to select or configure protection, see an adjustable water pressure regulator.
- Match hoses and fittings. Use connections that match the marked ports and the parts actually supplied with your unit. For a WS-P-16, confirm the supplied parts against the manual package list; the listed package includes a female hose quick-connect adapter, two male hose quick-connect adapters, a Y-splitter, a shut-off valve, a 5-foot hose, and a 3/4-inch connection brass double-female adapter. For the hose that carries water to the RV, select a certified drinking water hose and verify its suitability in the hose and RV manuals.
If you need to isolate the water supply before changing a connection, do so as a safety precaution. The manuals cited here do not present that as an additional numbered setup step.
Model-Specific First Flush and Connection
Use only the branch that matches your unit. Do not mix the On The Go forward-flush arrangement with the WS-P-16 reverse-preflush arrangement.
On The Go Standard, Double Standard, and Park Model
For a new On The Go unit, turn off the water feeding the point of application, connect the source water to the inlet, and make sure the unit stands upright.
- Turn off the water feeding the point of application.
- Connect the source water to the softener inlet.
- Keep the unit standing upright for use.
- Turn the water on and flush the system into the protected discharge arrangement before connecting the outlet to the RV:
- Standard: 2 to 3 minutes
- Double Standard: 4 to 6 minutes
- Park Model: 7 to 9 minutes
- After the selected flush, connect the softener outlet to the point of application.
- Check for leaks and make sure the top cap and hoses are secure.
Do not add salt or run regeneration before first use on a new On The Go unit, and do not remove the material from inside the tank.
Stop if you used the wrong model branch or flush duration, routed discharge through an unprotected drain, damaged the unit, or observe a persistent abnormality.
PRO+AQUA WS-P-16 Reverse Preflush, Then Service
For a WS-P-16, complete the initial reverse preflush before setting up normal service. Do not install the unit if any part is cracked or damaged.
- Inspect the unit and supplied parts. If any part is cracked or damaged, do not proceed; contact PRO+AQUA for an exchange or diagnosis.
- Keep the unit upright. Connect the incoming water hose to the OUT port on the tank head, using the supplied female fitting if needed.
- Attach another garden hose to the IN port and direct it to a permitted drainage area or driveway. If no garden hose is available, place the unit on level ground with space to release water. Keep the unit upright.
- Turn the water on and flush for 5 minutes, until the water flows clear. The manual says it is normal to see color or particles on the first flush.
- After the preflush, change to the normal service configuration: connect incoming water to IN and connect a secondary hose to OUT.
- Route the OUT hose to the RV City Water Connection or City Fill inlet. Verify the actual inlet label and RV manual before connecting.
- Keep the unit upright during service.
Do not reuse the reverse-preflush port arrangement for normal service. Stop before connecting the RV if the water does not clear, if you see unexpected leakage or damage, or if the ports or RV inlet remain ambiguous.
If you install the WS-P-16 for travel in an RV, the manufacturer recommends securing it with a strap. That recommendation does not establish a tie-down design or approve use of the unit while the RV is moving.
How to Check for Leaks and Verify Softening
A successful setup has no visible leaks, a completed model-specific flush, and a treated-water hardness result that supports softening. Clear water alone does not prove the water is safe.
Leak Checks
For an On The Go unit, check for leaks and make sure the top cap and hoses are tightened securely. If a leak persists or you do not know the correct gasket or thread-sealing method for your actual fitting, stop and follow the fitting-specific manufacturer instructions rather than improvising a seal.
Hardness Verification
Measure hardness with a hardness test kit or an independent laboratory test. After installing treatment, test the treated water to confirm that the treatment is working, then follow the manufacturer’s cleaning and maintenance recommendations.
This hardness check verifies the softening target. It is not a microbiological or chemical safety test. Softening does not establish disinfection, and certification to a water-treatment standard does not mean a system reduces every possible contaminant.
What a Successful Setup Looks Like
Your setup is ready for continued use only when all of the following are true:
- The correct model and manual branch were used.
- The unit remained upright.
- The first flush followed the model-specific duration and endpoint.
- The discharge stayed separated from plumbing drains and sewers.
- No visible leak remains at the checked connections.
- A hardness test of treated water supports the intended softening result.
Stop and seek appropriate OEM or water-authority guidance if you find a leak, softening does not occur, or you have any water-safety concern.
Common Setup Mistakes and Supported Fixes
| Mistake | Applies to | Supported fix |
|---|---|---|
| Using another model’s flush duration | On The Go Standard, Double Standard, Park Model | Use the duration for the exact model: 2 to 3, 4 to 6, or 7 to 9 minutes. |
| Connecting OUT to the RV before the first flush | On The Go units | Flush first, then connect the outlet to the point of application. |
| Keeping the reverse-preflush arrangement in service | PRO+AQUA WS-P-16 | After the preflush, connect incoming water to IN and the secondary hose to OUT. |
| Operating the unit on its side | On The Go and WS-P-16 | Keep the unit upright for use or installation. |
| Removing material from inside an On The Go tank | On The Go units | Do not remove the material from inside the tank. |
| Adding salt or regenerating a new On The Go unit before first use | New On The Go unit | No salt or regeneration is required before first use. |
| Sending flush water to a plumbing drain or sewer | Both branches | Use a protected, permitted discharge arrangement; never make a direct potable-to-sewer connection. |
| Treating clear or softened water as proof of safety | Both branches | Use the appropriate test for the actual concern and follow OEM maintenance; a hardness test is not a safety test. |
| Assuming a pressure setting | Both branches | Follow the softener, regulator, and RV manuals. No universal setting is supplied here. |
What to Do After the First Setup
After the first setup, follow the manufacturer’s recommendations for cleaning and maintenance. Recurring regeneration, storage and restart, and troubleshooting are separate tasks with their own model-specific procedures.
Portable RV Water Softener Setup FAQs
Does a new On The Go softener need salt or regeneration before first use?
No. A new On The Go softener does not require salt or regeneration before first use. This applies to a new unit, not to restarting one after storage.
How long should the first flush run?
It depends on the model. Flush an On The Go Standard for 2 to 3 minutes, a Double Standard for 4 to 6 minutes, or a Park Model for 7 to 9 minutes. Flush a WS-P-16 for 5 minutes, until the water flows clear.
Is the WS-P-16 first flush the same flow direction as normal service?
No. The WS-P-16 initial preflush feeds incoming water to OUT and discharges from IN. For normal service, incoming water connects to IN and the secondary hose connects to OUT.
Can I send the first flush to a plumbing drain?
Not directly. Use a protected, permitted discharge arrangement. If you use a drain receptor, apply the applicable air-gap protection, and never connect the discharge directly to a sanitary sewer.
Does the softener stand upright or lie on its side?
It stands upright for use. On The Go instructions say to make sure the unit is standing upright, and the WS-P-16 manual says never to install it on its side.
What if the WS-P-16 flush water does not clear?
Stop before connecting the unit to the RV and contact the manufacturer. This guide does not provide an extended-flush schedule, flow rate, or pressure setting.
How do I check that the softener is working?
Use a hardness test kit or an independent laboratory test to measure source water and treated water, then follow the manufacturer’s maintenance recommendations.
Does clear or softened water mean it is safe to drink?
No. A hardness test verifies softening, not microbiological or chemical safety. Softening does not establish disinfection, and treatment certification does not mean every possible contaminant is reduced.
What water pressure should I set for the softener?
This guide does not supply a universal pressure setting. Follow the pressure requirements in your softener, pressure regulator, and RV manuals.
