The Scotsman AP1-P Aqua Patrol Plus is a single-cartridge water filtration system built for operators of commercial ice machines. It is sized for cubers up to 650 lb and for flakers, nuggets and nugget dispensers up to 1,200 lb.
This guide covers Scotsman AP1-P system installation for a first-time setup, with an estimated 15–30 minutes for a straightforward install. An expired cartridge stops filtering and lowers water quality, so replace it on time using our APRC1-P filter replacement guide.
Safety & Preparation
Check that the ice machine's production rating falls within the AP1-P's limits: cubers up to 650 lb (295 kg) and flakers, nuggets and nugget dispensers up to 1,200 lb (544 kg). Also confirm that the system's maximum flow of 2.1 gpm suits the machine.
⚠️ Supply & Operating Limits
Choose the Mounting Location
The unit measures 5.6" W x 4.75" D x 21.5" H, and its shipping weight is about 7 lb. Pick a secure mounting spot that fits those dimensions, and find the shutoff for the supply line before work begins.
AP1-P dimensions, with the inlet and outlet positions for planning the mounting space
Before mounting, make sure the supply line and the ice machine line can both reach their connections. The connection order is covered in Step-by-Step Installation.
🚰 Inlet
3/8" FNPT. Connects to the water supply line.
🧊 Outlet
3/8" FNPT. Connects to the line running to the ice machine.
Have Everything Ready
🧰 Materials
Included with the system:
You will also need:
⚠️ Safety Precautions
Step-by-Step Installation
Common Installation Mistakes
A quick check for the mistakes below prevents most problems with a Scotsman Aqua Patrol Plus system installation. Red cards show what to never do, and amber cards show mistakes that are preventable and can be fixed. Each card links to the section with the details.
Water pressure and temperature each have a set operating range. Check your supply against the limits in Safety & Preparation before connecting the system.
Compare the ice machine's production rating with the limits in Safety & Preparation. If the machine exceeds them, see the double system in Product & Replacement Options.
SSM Plus and Aqua Patrol Plus models have separate cartridges. Order only the part number listed in When to Replace Your Filter Cartridge.
The supply line belongs on the inlet, not the outlet. If the lines are reversed, shut off the water and reconnect them following steps 4 and 6 of Step-by-Step Installation.
A loose or unsupported mount strains the lines. If the unit moves, shut off the water and resecure the bracket following step 2 of Step-by-Step Installation.
A new cartridge needs flushing before the ice machine is connected. If the flush was skipped, shut off the water, disconnect the ice machine line at the outlet, and flush using the guidance in What to Expect After Installation.
What to Expect After Installation
For the flush in step 5 of Step-by-Step Installation, run water through the system for several minutes, until the water runs clear. This clears air and carbon particles from the new cartridge. If the instructions packed with the system give a specific flush time or volume, follow those instead.
Once the outlet is connected in step 6, check all connections for drips and confirm steady flow to the ice machine. Then compare the results with the two columns below:
✅ Normal After Installation
🔎 Worth a Second Look
🟢 Ready for use: flow is steady, the lines are dry, and the ice machine fills normally.
If you see anything in the right-hand column, check Common Installation Mistakes and Troubleshooting & FAQ.
Official Product Resources
The manufacturer's spec sheet lists the system's dimensions, flow, connections, operating requirements, and certifications. For the manifold and cartridge details, follow the installation instructions included with the system.
When to Replace Your Filter Cartridge
The commonly recommended practice is to replace the cartridge about every 6 months, or sooner if either of the other two conditions below applies:
As a regular recommended practice.
When flow drops noticeably.
When you notice a change in water quality.
To stay on time without tracking dates, the filter subscription is a set-it-and-forget-it option. It ships the cartridge every 6 months and saves 10%.
The replacement for the AP1-P is the Scotsman APRC1-P, which pairs half-micron filtration with polyphosphate scale inhibition. To replace it, shut off the water, remove the used cartridge, and seat the new one in the manifold. Then flush the system as described in What to Expect After Installation.
Open-box note: the cartridge is unused and factory-fresh, but the packaging may show wear. Open-box orders are not returnable.
🔎 More from Scotsman: Scotsman offers commercial ice machines along with water filtration for them. Browse the full Scotsman collection, including ice machines, water filter systems, and replacement cartridges.
How to Maximize the Lifespan of Your Filter
A few regular checks help the system stay within its limits and the cartridge stay on schedule:
- Keep the supply within its limits — hold water pressure and temperature inside the ranges in Safety & Preparation.
- Inspect the system periodically — look over the unit and connections for leaks or reduced flow.
- Keep the area around the unit clear — leave room to reach the cartridge at replacement time.
- Use genuine cartridges on schedule — install only genuine Scotsman Aqua Patrol Plus cartridges, and follow the schedule in When to Replace Your Filter Cartridge.
- Avoid unsafe water — do not run the system on unsafe or unknown-quality water without disinfection.
Troubleshooting & FAQ
How long does Scotsman AP1-P system installation take?
A straightforward first-time installation typically takes 15 to 30 minutes, including mounting the bracket, connecting the inlet, flushing the new cartridge, connecting the outlet, and checking for leaks. Plan extra time if new water lines have to be run to the location.
Can the AP1-P be used with a non-Scotsman ice machine?
It may work with other brands if the connections and flow rates match, but the system is optimized for Scotsman machines. Have a professional installer confirm the match before you install it. The AP1-P's rating, flow, and connections are in Safety & Preparation.
Can I keep my existing filter when I replace the ice machine?
Install a new cartridge. Scotsman recommends a new one if the filter was used with a prior ice machine. Also confirm that the new machine falls within the AP1-P's rating and maximum flow.
Should a water-cooled condenser line run through the AP1-P?
No. Run only the ice-making water through the system. Scotsman's manuals say to filter the water to the reservoir, not the condenser. Connect the condenser inlet to the water supply ahead of the filter.
Does the AP1-P remove chlorine, and what is it certified for?
It reduces chlorine, but it is designed to leave a residual in the water so the ice machine stays cleaner longer. Scotsman says its ice-making process then removes noticeable chlorine, so the ice has no chlorine taste or odor. The system is certified to NSF/ANSI Standard 42 for chlorine reduction class 1, taste and odor reduction, and particle reduction class 1, and to Standard 53 for turbidity, cyst, and asbestos reduction. Its polyphosphate feed inhibits scale buildup.
Which cartridge fits the AP1-P?
The AP1-P uses the Scotsman APRC1-P, which is also sold in the APRC6-P 6-pack. The SSMRC1 and SSMRC6 are separate cartridges for SSM Plus systems, so check the part number before ordering.
What should I do if a connection leaks?
Shut off the water supply first. Confirm the fitting matches the 3/8" FNPT connection, remake it, then open the supply slowly and check again. If water is coming from the manifold, remove the cartridge and reseat it securely. Also confirm that water pressure does not exceed 80 PSIG.
What causes low flow or sputtering after installation?
Trapped air is a common cause, so finish the flush first. If flow stays low, confirm the supply is fully open and water pressure is at least 20 PSIG. Then shut off the water and reseat the cartridge. If flow drops noticeably later in the cartridge's life, it is due for replacement.
Product & Replacement Options
These options cover ongoing system needs, from a larger system to cartridges for stocking ahead. You can also browse the full Scotsman collection, from ice machines to filtration:
For higher-flow applications within the same capacity range as the AP1-P (cubers up to 650 lb and flakers/nuggets/nugget dispensers up to 1,200 lb) at up to 4.2 gpm.
View Product →Six Aqua Patrol Plus replacement cartridges for stocking ahead.
View Product →The same 6-pack as an open-box listing. The cartridges are unused, but the packaging may show wear, and open-box orders are not returnable.
View Product →🧊 Shop Scotsman Ice Machines & Water Filters
Never Run Out of Replacement Cartridges
Subscribe to the APRC1-P with auto-delivery every 6 months and save 10%.
Conclusion
A Scotsman Aqua Patrol Plus system installation comes down to six steps. Mount the unit securely, confirm the cartridge is seated, and connect the inlet. Then flush the system before connecting the outlet to the ice machine, and check every connection for leaks, following Step-by-Step Installation.
After installation, keep the cartridge on the schedule in When to Replace Your Filter Cartridge, or use the subscription to handle the timing. When a cartridge is due, our APRC1-P filter replacement guide covers the procedure.