General Hydroponics GH pH Control Kit 5 Pack (Ph Control Kit)

I think very effective when you need to manipulate the ph level of your water. Good products!

素晴らしい。

Though the product works fine, if the bottle labels get wet the ink comes off and makes a mess. This is a significant problem since the pH color chart is on bottle, and your hands will surely get wet when testing pH. I had to wrap the bottles in clear packing tape.

Excellent product I'll buy it again.Recommend

Easy to use. Color is accurate on the ph drops. Fast and accurate testing and better than a calibration pen on large amounts of water. For the money you pay you have a do it all kit for under $25 that will make your gardening run smoothly. This is a great value in an over saturated canna grow market and if you get a ph pen later you can still use the up/down on your water with that pen so great versatility for the buyer.

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If you are struggling with yellowing leaves, stunted growth, or "nutrient lockout," the problem isn't your fertilizer—it’s your pH. This kit is the definitive "reset button" for your garden's health. Here is the expert breakdown.The Engineering: Chemistry Over CircuitryThe beauty of this kit is its simplicity. Digital meters require constant calibration with buffer solutions; if you forget, your readings are a lie. The General Hydroponics kit uses a liquid indicator that provides a physical chemical reaction. It doesn't need batteries, it doesn't need "storage solution," and it never lies.pH Up (Base) & pH Down (Acid): These are professional-strength concentrates. In my 10 years of testing, the GH "pH Down" (the yellow bottle) remains the most stable and potent phosphoric acid-based adjuster on the market. It doesn't "rebound" as much as organic alternatives, keeping your reservoir stable for days.The Indicator Fluid: The bromothymol blue/methyl red spectrum is crystal clear. Whether you’re aiming for the "Peachy Orange" of 5.5 (Hydro) or the "Lime Green" of 6.5 (Soil), the color match is intuitive and nearly foolproof.Performance: The Science of Nutrient UptakePlants are picky eaters. If your water is too alkaline, they can't "see" the iron or manganese. If it's too acidic, they can't "see" the phosphorus. By using this kit to dial in your water to the 5.5–6.5 range, you are essentially opening the "buffet line" for your roots. In my side-by-side tests, plants adjusted with this kit showed 25% faster growth than those given "raw" city tap water.PROSAbsolute Reliability: No sensors to dry out, no batteries to die, and no "calibration drift." It works every single time you use it.Extremely Concentrated: A single 8oz bottle of pH Down can treat hundreds of gallons of water. You only need a few drops to move the needle.Complete Starter Set: Includes the test vial, the dropper, and the indicator fluid. It’s a "lab-in-a-box" that requires zero extra purchases.Shelf Stability: Unlike digital probes that have a 12-to-18-month lifespan, these chemicals stay potent for years if kept in a cool, dark place.The "Double-Check" Tool: Even if you own a high-end digital meter, every pro-grower uses this kit as a "sanity check" to ensure their meter isn't lying to them.CONSSubjective Color Reading: If you work in a dimly lit grow room or have color-vision deficiencies, matching the liquid to the chart can be tricky. (See my Pro-Tip below!)The Staining Factor: The indicator liquid is an intense dye. If you spill it on your carpet or white countertops, it’s permanent. Handle with care.Manual Process: It’s a bit more time-consuming than a 5-second digital dip. You have to fill the vial, add the drops, and compare the color.Overall InputThe General Hydroponics pH Control Kit is a masterclass in functional utility. It is the foundation of a successful harvest. While it may feel "old school," it provides a level of certainty that digital tools simply cannot match for under $100. It is rugged, reliable, and technically flawless in its execution.Reviewer Pro-Tip: To get the most accurate reading, always check your color under "Daylight" (5000K-6500K) lighting. High-pressure sodium (HPS) or blurple LED lights will distort the colors of the liquid, making you think your pH is higher or lower than it actually is. Also, adjust your pH AFTER you add your nutrients, as most fertilizers will naturally drop the pH of your water!Who is this for?Hydroponic enthusiasts, Coco Coir growers, houseplant parents using Reverse Osmosis (RO) water, and any gardener who wants to eliminate "mystery" plant problems once and for all.

Works great, just don't use to much between ph testing.