Salt Chlorine Generator vs. Dry Chlorine Feeder: Which One Actually Fits Your Pool

A question I get a lot, from pool owners wondering about their options: “My pool store just quoted me $1,600 for a salt system, but my neighbor says I should get a tablet feeder instead for $200. They both say ‘automatic chlorine.’ What’s the actual difference?”

Turns out, the pool owner asking was staring down two pieces of equipment that work through entirely opposing chemistry, cost structures, and maintenance rhythms—yet the industry talks about them as if they’re essentially interchangeable. Over the years of maintaining my own pool and helping out with my neighbours’ and family’s pools, I’ve seen both technologies up close, replaced a salt cell at $600, and watched pools get pulled back from “chlorine lock” caused by runaway CYA from feeder tablets. Both systems deliver safe water. The actual question is: which one solves your specific situation without introducing a different headache down the road?

What nobody walks you through before the install happens: the phrase “chlorine generator” masks two entirely separate contraptions. One manufactures chlorine directly inside your pool water through electrolysis of dissolved salt. The other sits on your return line and automatically dissolves stabilized tablets, metering their byproducts into circulation. The underlying processes are reversed. The dollars you spend up front are reversed. The yearly upkeep is reversed. Yet most retail environments discuss them like picking a paint color—barely different, pick whichever costs less.

Let me walk through the real mechanics of salt chlorine versus dry chlorine feeder, and point you toward the one that actually makes sense for your water.

Understanding Why This Distinction Actually Matters

The gap between understanding salt chlorine and dry chlorine feeders gets expensive fast—sometimes thousands of dollars in the wrong direction.

Here’s the practical consequence: when your equipment dies or a new pool gets built, you’re making this call under deadlines. The retail associate throws out “automatic chlorination,” quotes you a salt installation in the $1,200–$1,800 ballpark, and you go along because automation seems easier. Fast-forward thirty-six months: you’ve swapped out a $500 cell, dropped $200–$400 yearly on tablets as a backup (running a floater alongside the system), and your CYA somehow reached 120 ppm because the arithmetic behind these systems never got explained.

Alternatively: you grab a $150 inline feeder, feel smart about the bargain for a few months, then wake up in year two watching your CYA drift north of 80 ppm. A $1,500 drain-and-refill to reset stabilizer sits in your future, and now you’re second-guessing whether you should’ve committed to the salt system from the start.

Where the confusion starts: retailers, service teams, and sometimes even equipment makers skip right past the chemistry—the “what’s actually happening to your water” part—and just hand you a label: “salt” or “tablets,” then act like that’s enough information.

The actual mechanism: A salt chlorine generator takes sodium chloride dissolved throughout your pool and breaks it apart via electrolysis—low-voltage DC current running through titanium plates inside a cell. That process creates chlorine gas, which instantly becomes hypochlorous acid in your water (your real sanitizing agent). The generator’s running continuously whenever the pump flows, releasing chlorine 24/7 in steady micro-doses.

A dry chlorine feeder operates on a fundamentally different principle: it’s a chamber holding stabilized trichlor tablets (typically the 3-inch size, containing roughly 90% available chlorine). A portion of your return water gets routed through the chamber by a valve assembly you control with a rotary dial. The flowing water erodes those tablets gradually, and chlorinated water gets sent back into your circulation at a dose you regulate. No cell, no electrolysis, no DC power—just tablet erosion and water movement.

Each approach pushes chlorine into your water, and both keep pools swimmable and microbe-free. However, the chemical profile they create inside your pool unfolds very differently, and those differences compound as seasons pass.

What to Look For in an Inline Automatic Chlorine Feeder

If you’re considering a dry chlorine feeder as your primary chlorination method—or as a backup system for a salt pool—here are the features that actually matter, and where the Hayward CL200EF in-line automatic chlorine feeder stands out from cheaper alternatives.

Tablet Capacity and Material Durability

The Hayward CL200EF accommodates approximately 9 pounds of trichlor tablets—that’s around 12–15 standard 3-inch tablets, depending on how firmly they’re stacked in the chamber. For a typical 15,000-gallon residential pool in the Southwest, you’re looking at 2–4 weeks between refills; colder climates or lighter use might stretch that to 4–5 weeks.

The exterior is injection-molded polypropylene engineered to resist UV degradation, and the internal passages tolerate the mildly corrosive environment created by trichlor breakdown. Budget alternatives sometimes skimp on material quality—thinner plastic, non-UV-stabilized resin, or metal components that corrode within a season. The CL200EF’s construction means you’re getting 5–7 years of reliable operation if you’re treating it normally.

Variable Flow Regulation Mechanism

The core function of any feeder is the dial valve governing how much return water passes through the tablet chamber. The CL200EF features a smooth, continuously variable dial—not the stepped multi-position switches you’ll find on cheaper units—permitting fine-grained adjustment across roughly 0.5 to 3 ppm of free chlorine increase per pass-through. You’re able to dial your pool to an exact dose without the jerky on-off cycling that makes economy feeders unreliable.

Why this specificity works in your favor: a poorly calibrated feeder either undersupplies and lets green water develop, or overshoots and stacks up combined chlorine (chloramines), causing that infamous “chlorine stench” that guests complain about—even though your test kit shows adequate free chlorine. Precision prevents both problems.

Pressure Relief and Reverse-Flow Protection

The CL200EF integrates a pressure-relief valve that activates if your tablet chamber gets plugged (calcium scale is the typical culprit, or a tablet wedged at an angle). Without this safeguard, internal pressure climbs and eventually ruptures the housing seal or starts leaking at the fittings. That little valve is the difference between a five-season feeder and one that springs a leak in year two.

Similarly, an internal check ball prevents backflow—your pool’s water siphoning backward through the canister after the pump shuts down, which erodes tablets out of sequence and creates uneven chlorine spikes. Lower-tier feeders routinely skip both of these.

Refill Access and Seal Integrity

The CL200EF tops with a hinged cover incorporating a replaceable rubber o-ring seal. Refilling takes roughly ninety seconds with no tools required. Poor sealing design—or one that forces you to disassemble half the feeder every refill—becomes unbearable by the time you’ve done it thirty times. This model’s approach keeps maintenance painless.

One genuine constraint: the Hayward CL200EF was engineered for pools up to roughly 20,000 gallons. Larger pools (30,000+ gallons) may require dual feeders operating in series, or you accept that tablet refills happen every 10 days instead of every couple of weeks. That’s not a product shortcoming—it’s the physical reality of how feeder capacity scales.

How to Operate It Like Someone Who Tests Before Treating

Getting one installed isn’t difficult; most DIY-capable pool owners handle it themselves in an afternoon, though a licensed technician usually finishes in under sixty minutes. The feeder must be positioned on your return line downstream from the filter but before water re-enters the pool. This ensures you’re dosing clean filtered water, not having raw trichlor grains floating unpredictably into the deep end.

Plumbing is elementary: you install a tee into your return line using 1.5-inch PVC, use slip unions on both sides of the feeder assembly (making future removal a ten-minute job rather than a draining event), and adjust your dial based on current free chlorine readings and your pool’s consumption rate.

Dialing In Your Output: Step-by-Step Method

This is the tested approach I use whenever commissioning a fresh feeder installation:

• Insert fresh tablets into the chamber and rotate the dial to the 50% mark (middle of its adjustment span).
• Run the pump for 48 hours under normal operating conditions (accounting for your typical hourly run time).
• Perform a free chlorine test. Ideally, you’re seeing steady upward movement but staying beneath your target range (1.5–3 ppm for residential pools). If it’s static or dropping, increase the dial. If it’s climbing faster than desired, decrease the dial.
• Make incremental shifts (quarter-dial rotations) and pause for another 24-hour cycle before making subsequent adjustments. Chlorine response has a time lag; don’t get impatient and spin the dial excessively, or you’ll overshoot.

Throughout the active swimming season, pull free chlorine readings at minimum twice weekly (bump to three times if you’re hosting heavy usage). When free chlorine edges above 5 ppm, dial backward slightly. Consistently reading below 1 ppm? Dial upward. Once you hit equilibrium, this whole sequence takes five to ten minutes per week.

Refilling Tablets and Maintaining the Seal

Between two and four weeks into the swimming period, you’ll need to top off your tablets. Open the sealed top, extract whatever tablets remain (some nearly gone, some just smaller pieces), and stack fresh 3-inch trichlor tablets inside. Before reclosing, ensure that the o-ring is damp and free of residue—o-rings that sit dry shrink and crack, and o-rings caked with tablet dust or mineral deposits won’t seal reliably. I run mine under a garden hose during each refill and look for any visible cracks or hardened sections.

When your feeder’s output suddenly drops with no obvious explanation, the o-ring is almost always your culprit. A compromised seal allows water to bypass the tablet chamber without absorbing chlorine, and you’ll think the unit malfunctioned when it’s really just leaking past the seal.

CYA Accumulation: The Conversation Pool Stores Avoid

Here’s what deserves your attention: trichlor tablets are formulated with cyanuric acid (CYA) as a stabilizer. Each tablet you burn contributes approximately 0.5–1 ppm of CYA into your pool’s water. CYA is permanent—it doesn’t evaporate, decompose, or leave naturally. The only removal mechanism is dilution or tank water replacement.

For a feeder-operated pool, CYA accumulation is inevitable and steady. Start logging CYA concentrations each season. You’re still in good territory until around 60–80 ppm. But once CYA surpasses 80–100 ppm, chlorine effectiveness takes a nosedive. A reading of 2 ppm free chlorine in a pool sitting at 100 ppm CYA? That’s functionally behaving like 0.5 ppm in an untreated pool—this is what “chlorine lock” means.

The remedy: every couple of years, schedule a partial drain—remove roughly one-quarter to one-half of your water volume and refill with fresh supply. This brings CYA back into the sweet spot (20–40 ppm is optimal). It sounds tedious, but it’s manageable. Most feeder-pool owners do this at season’s transition point when they’re already thinking about water refresh anyway.

Building Your Complete Maintenance Framework

An inline feeder doesn’t qualify as “install and ignore.” But salt generators demand a different type of ongoing attention, not necessarily less.

With a feeder installed, your weekly rhythm stays streamlined: test free chlorine (along with standard pH and alkalinity measurements) twice during peak season, tweak the dial if numbers drift, and visually inspect that o-ring when you’re refreshing the tablet stack. Each season, measure CYA and track whether it’s rising. Keep records—a basic spreadsheet works—to spot trends (rapid CYA climbs usually signal higher bather volume; slower accumulation typically indicates good water dilution from rainfall).

A feeder integrates smoothly with **routine brushing and vacuuming** (no different than any chlorine pool), **regularly scheduled filter backwashes** (every 4–6 weeks depending on load), and **pH adjustment with liquid acid**—yes, feeder pools still require acid management, especially in the Southwest where our source water arrives naturally alkaline. The feeder handles sanitization only; pH correction is a separate task.

Off-season adjustments: When water temperatures drop and swimmer traffic diminishes, you have the option to scale back the feeder dial or shut it entirely, using periodic shock treatments (every couple to three weeks) as your sole chlorine source. This conserves tablets and moderates CYA growth. When warmer weather returns, gradually increase the dial back over a few days with testing between adjustments. Salt cells, by contrast, continue firing at full output round-the-clock, regardless of whether swimmers are present.

Another point: shock treatments (monthly or post-party) remain compatible with a running feeder. The feeder’s role is sustaining your baseline; shocking is a separate, higher-dose intervention. Just refrain from stacking chlorine sources without testing first—it’s tough to accidentally overchlorinate, but it’s technically possible.

Deciding Which System Fits Your Reality

Salt chlorine versus dry chlorine feeder doesn’t boil down to one being universally superior. It’s about which suits your financial situation, frequency of use, and preferred maintenance style.

Choose an inline automatic chlorine feeder—like the Hayward CL200EF—if you’re building a new pool on a tight budget, you have a smaller or seasonal pool, you’re comfortable managing CYA with periodic dilution, or you want a simple backup system for a salt pool. The upfront cost is $60–350 depending on whether you DIY, and it’ll deliver years of reliable chlorination for $150–350 per season in tablets.

Opt for a salt chlorine generator if you’re viewing this as a long-term commitment, prefer daily operations that run semi-autonomously, use the pool regularly, and can absorb the cost of a $500–$800 cell replacement every 3–7 years down the road. Your initial outlay is steeper, but day-to-day chlorine balancing (separate from pH work) becomes much more hands-off, and the water chemistry tends to feel gentler on skin.

I’ve run both at different times. I’ve watched both perform brilliantly. I’ve also had both create frustration when they were misaligned with a property’s specific load and usage. The biggest error is letting someone outside your situation pressure you into a decision without understanding the tradeoffs yourself. Now that you grasp what separates these systems, you’re positioned to pick the one that genuinely works for your water.