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Pool pH Made Simple: Raise It, Lower It, Lock It In

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Pool pH control sits at the heart of clear, comfortable, and protected water. pH is a scale from 0 to 14, with 7.0 neutral and 7.4 to 7.6 ideal for most pools. Drift too low and bathers feel itchy eyes and skin while metals and heater parts corrode. Drift too high and chlorine weakens, scale forms, and water clouds. The fix is not guesswork; it’s understanding buffers and cause-and-effect. Alkalinity, cyanuric acid, and borates all resist pH swings in different ways, and choosing the right chemical at the right time saves money, time, and surfaces. Total alkalinity is the primary pH buffer. High alkalinity blunts the impact of acid, making pH hard to lower; low alkalinity removes that cushion and lets pH plummet when you add acid. In plaster pools with chronic high pH, running TA around 70 to 80 helps acid work efficiently. In vinyl or fiberglass pools that drift low, keeping TA higher slows dangerous drops. This interplay explains why a single quart of muriatic acid can crash pH in a ...
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Water Parameters That Actually Matter

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Clear, stable pool water is not a mystery; it is chemistry applied with purpose. We walk through the seven parameters that truly control balance: pH, total alkalinity, calcium hardness, temperature, total dissolved solids, cyanuric acid, and the chlorine you measure to protect swimmers. Industry “ideal ranges” help, but they often leave a wide gap that causes confusion in day-to-day care. That is why we focus on target values inspired by Bob Lowry’s approach, then validate the interplay with the Langelier Saturation Index using tools like the Arenda app. When you aim at specific targets instead of broad ranges, you correct faster, stabilize sooner, and stop chasing your tail after every heatwave or rainstorm. Start with pH because it drives comfort, sanitization efficacy, and LSI. A steady 7.5 is practical and lands right where chlorine is effective without pushing the water toward corrosion or scale. Pair that with total alkalinity around 90 ppm to buffer pH without forcing it upward ...
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Best Tools for Pool Water Accuracy

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Many pros want a single device that nails speed, accuracy, and price for pool water testing. The truth is less tidy: no one tester dominates every job. The Lamotte SpinTouch, photometers like PoolLab 2.0 and ColorQ, Taylor reagent kits, and test strips all have places where they shine and places where they fall short. The best results come from matching the tool to the task. When we stop hunting for perfection and build a flexible toolkit instead, our readings get more reliable, our routes run smoother, and our customers gain trust in what we present to them. Consider the SpinTouch as a specialized instrument rather than a daily driver. Its core appeal is speed and breadth: up to ten factors in about a minute, with optional discs for borates, phosphates, and salinity. Borrowed from medical diagnostics, the spinning disc and onboard optics deliver precise digital numbers with very little guesswork. The downside hits your wallet. The unit exceeds a thousand dollars and each disc is singl...
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The Next Level of Clean — Now Even Bigger for Pool Pros

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The Next Level of Clean — Now Even Bigger for Pool Pros For pool professionals, there’s a difference between simply picking up debris and delivering a pool that looks truly finished. The Bottom Feeder and Shrimp vacuum systems are already legendary for handling heavy debris like leaves, acorns, and large material with ease. But what about fine silt, dust, pollen, or dead algae? These particles often escape standard mesh bags, leaving a haze behind even after a thorough vacuum. We listened to that feedback — and built a better solution. Introducing the Cartridge Filter Assembly Extension Kit Double the Filtration for Very Dirty Pools For pools with heavy dirt loads, the Cartridge Filter Assembly Extension Kit is the upgrade you’ve been waiting for. Here’s what it includes: Cartridge connector insert Two extended support rods An additional 50 sq ft cartridge filter When installed, the Extension Kit allows you to stack two 50 sq ft cartridges , creating a total of 100 sq ft of filtration...
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The Truth About Liquid Pool Chlorine

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Liquid chlorine, also known as sodium hypochlorite, is one of the most dependable sanitizers for both service pros and homeowners because it delivers fast, predictable results without loading the water with stabilizer or calcium. The key is understanding its nature as an unstabilized chlorine and planning around sunlight and time. Commercial-grade liquid chlorine typically runs at 10 to 12.5 percent, far stronger than household bleach at 5 to 8.25 percent. This strength means a single gallon can raise free chlorine quickly for shock or routine boosts, with minimal side effects beyond a brief pH rise and a small sodium addition that has little practical impact on water balance. When you want a swift response—killing algae, breaking combined chlorine, or clearing a murky pool—few products match fresh liquid chlorine. The catch is that unstabilized chlorine does not linger. Sunlight strips it away unless the water has adequate cyanuric acid, generally between 30 and 80 ppm depending on cl...
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Myth vs. Reality: Pool Chemicals Edition

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Pool care runs on chemistry, yet many of the loudest rules come from habit, not science. This episode takes aim at three big beliefs: the acid “column” or “slug” method, the idea that liquid chlorine always raises pH, and the notion of “chlorine lock.” Each claim contains a grain of logic, which is why they persist, but the full picture clarifies what really happens in water. We also address swimmer safety after dosing—how soon you can get back in after adding chlorine or muriatic acid—and why circulation and cyanuric acid levels matter more than a blanket 24-hour rule. If you maintain pools for clients, this knowledge trims costs, protects surfaces, and keeps water safer and clearer. Let’s start with the acid column myth. The story says that pouring all your muriatic acid in one deep-end spot drops total alkalinity without much effect on pH, while walking it around drops pH more. It sounds plausible if you imagine acid “sinking,” but that mental picture fails at the molecular level. M...
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Zero Chlorine? Here’s What’s Really Happening

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 When a pool refuses to hold chlorine, the knee-jerk reaction is to add more. But most vanishing-chlorine stories start with movement, not chemistry. Poor filtration lets debris and organics linger, and weak circulation fails to spread sanitizer where it’s needed. Torn DE grids, an overused single cartridge, or starved pump runtime can turn a stable pool into a chlorine sink. Restore flow and run time first: clean or replace media, recharge DE, and aim for strong turnover with enough daily hours, especially in warm months. Once water is moving and clean, every other fix works faster and lasts longer. Water quality sets the chlorine demand. Cloudy or green pools carry a massive organic load that “uses up” sanitizer. That’s why a heavy shock in a swampy pool can vanish to near zero by morning even after adding gallons of liquid and bags of cal hypo. The water looks milky blue because the chlorine did its job killing algae and oxidizing waste, but the residual disappears under the loa...
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