Arkal Disc Filters

Build your pipe-threaded head assembly safely.

Step 1: Prep the Threads
Because this filter utilizes Pipe Threads (MPT), you must apply 2 to 3 wraps of Teflon tape to both the inlet and outlet threads to ensure a watertight seal. Do not use liquid pipe dope or over-tighten.

Step 2: Install the Filter
Thread the Arkal filter into your PVC manifold. Because it is rated for constant pressure, you have the flexibility to install it either upstream (before) or downstream (after) of your automated valves. Ensure the directional flow arrow points downstream toward your emitters.

Step 3: Adapt to Hose (If Needed)
If you are attaching this filter directly to a garden spigot or hose-end timer, thread a hose-to-pipe thread adapter onto the inlet and outlet.

Step 4: Routine Cleaning
Periodically turn off the water, unscrew the main filter canister, and remove the internal disc spine. Loosen the tension nut at the top of the spine so the discs separate slightly, then rinse them thoroughly with clean water before reassembling.

Why choose a disc filter over a screen filter?
While screen filters act as a flat 2D barrier, a disc filter uses a stack of grooved plastic rings to create a deep, 3D filtration pathway.

This "depth filtration" is incredibly effective at trapping organic matter like algae, moss, and slime that would immediately plaster over and blind a flat screen filter. Disc filters are essential for ponds and dirty well water.

Can I leave this filter under constant pressure?
Yes! Unlike many standard irrigation filters, the Arkal series is built and heavily reinforced to withstand constant pressure up to 140 PSI.

This means you can safely install it directly onto your mainline before your automated timer or irrigation valves, protecting the entire valve manifold from debris.

How do I attach this to my garden hose?
These filters feature standard Male Pipe Threads (MPT) and will not thread directly onto a garden hose or outdoor spigot.

If you are connecting this filter to a hose-threaded system, you will need to purchase and apply standard hose-to-pipe thread adapters to bridge the connection.

How should I prepare my Arkal filter for spring watering?
As you set up your system for spring, ensure the water is turned off, unscrew the main canister, and remove the disc spine to inspect the discs for any hard winter scale, algae, or damage.

Clean them thoroughly, ensure the large O-ring inside the cap is properly seated and lubricated, and hand-tighten the canister back on. Turn the system on to verify there are no leaks before attaching your drip lines.