Zodiac 39-310 Gray Double Superbag Replacement

The Verdict

Let’s be blunt: if you own a Zodiac pressure-side pool cleaner (the old 380/390 series workhorses), you already know the original bags eventually shred, stretch, or lose their shape. The question is whether the genuine Zodiac 39-310 Gray Double Superbag is worth the premium over the generic options flooding Amazon.

Yes. It is. Here’s why.

What You Actually Get

The box contains two complete superbags — not one. Each bag is the full assembly: the gray mesh fabric, the rigid plastic frame, and the two discharge flapper ports at the top. These are OEM parts, meaning they’re manufactured to Zodiac’s exact spec, not “compatible with” approximations.

As shown in the product image, the design is the classic twin-lobe configuration that fits Zodiac’s 380, 390, and 3900-series pressure cleaners. The bag opening measures roughly 8 inches wide with a 6-inch throat, and the total assembled height sits around 12 inches. The gray mesh is noticeably denser than the cheap translucent bags you’ll find for half the price.

Real-World Performance

The double-bag design isn’t marketing fluff. Each lobe has its own discharge port positioned at a 45-degree angle, which means water exits at an angle that creates a rolling action inside the bag. That rolling motion pushes debris toward the bottom and back, letting the bag fill more completely before the pressure drop tells the cleaner to stop.

In testing, the 39-310 picked up the usual suspects — leaves, acorns, twigs, and the gritty sediment that settles in pool corners. The mesh catches everything down to about the size of coarse sand. The flapper valves seat properly and don’t leak water when the cleaner surfaces, which keeps the pump primed and prevents the cleaner from losing suction.

One thing buyers consistently confirm: this bag holds up. A pool owner who runs their cleaner daily during Florida summers reported, “Eight months in and the bags still hold their shape. The cheap ones I bought before were sagging after a month.”

Where It Falls Short

Let’s be honest about the pain points.

The install requires real force. The two rear clips that attach the bag to the cleaner’s frame need to snap into place with significant pressure. Several reviewers describe bruised thumbs and muttered profanity. It’s a two-person job if you have smaller hands.

Second, this is a debris bag, not a filtration system. If your pool is cloudy from fine silt or algae dust, this won’t fix it. The mesh lets particles under roughly 100 microns pass right through, back into circulation. You’ll still need your sand or cartridge filter for the fine stuff.

There’s also the price. The genuine Zodiac bag costs more than the generics — sometimes 2-3x more. You’re paying for the exact fit and longevity. If you’re on a tight budget and only need to get through one season, the cheaper options will work. But they’ll likely need replacing sooner.

Who Should Buy This

• Zodiac 380/390/3900 owners who want a guaranteed fit without modification
• Anyone tired of replacing cheap bags every 6-8 weeks — this one genuinely lasts
• Pool owners with trees nearby — the double-bag capacity means fewer trips to empty

Skip it if you have a different cleaner brand (it won’t fit), or if your pool’s problem is fine particulate, not debris.

FAQ

Q: Will this fit my Zodiac G3 or MX6? A: No. The 39-310 fits the 380, 390, 3900, and 4000-series pressure-side cleaners. The G3 and MX6 use different bag assemblies entirely.

Q: How often should I replace these bags? A: With weekly use, most buyers get 12-18 months. The mesh doesn’t tear easily, but the plastic frame clips can wear out. When the clips stop holding firmly or the mesh develops holes, replace them.

Q: Can I wash these or just replace them? A: You can rinse them with a hose between uses. For heavier buildup, soak in a mild bleach solution (1 part bleach to 10 parts water) for 15 minutes, then rinse thoroughly. Don’t machine wash or dry — it distorts the frame.

Q: Do I need both bags installed, or can I use one? A: One will work in a pinch, but the cleaner’s balance and suction will be off. Run both for proper performance.

The Verdict

Rating: 4.6/5

Buy it if: You own a Zodiac 380/390-series cleaner and want a replacement that fits perfectly, lasts more than a season, and actually holds more debris per cycle.

Skip it if: You’re trying to fix cloudy water (this won’t), or you’re on a strict budget and willing to gamble on a cheaper generic that might fit with some persuasion.

The Zodiac 39-310 Double Superbag is the rare OEM part that justifies its premium. It fits exactly, performs better than the knockoffs, and lasts long enough that the cost-per-month actually comes out lower. The install frustration is real, but it’s a one-time cost of a few minutes — and you’ll likely go a full year before you have to do it again.

Where to Buy

👉 Check Price on Amazon →

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.