eneral Hydroponics pH Control Kit

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.

This product does exactly what it says it does! efficiently too! this product is 3 bottles pH-up, pH-down and a pH test solution. (also comes with a vial to conduct the pH testing in AND a pipette which I thought was great, I ended up getting on before I opened the package assuming they did not provide one, but General Hydroponics really gives you everything you need to open the package and do testing RIGHT AWAY!) I tested this on my hydroponic system with a calibrated pH meter hehe.....I wanted to know how accurate the test solution is. The test solution runs on a color scale, acidic being pink basic being dark green. The scale is located ON THE BOTTLE! so you never will lose it. As far as my basic testing concluded, the test solution is accurate; the color changes are visibly recognizable and comparable to the provided scale. 6.0 is yellow, 7.0 is green, and both of these matched my pH meter (in approximation, don't expect to perfectly get a 6.3 or something, this test kit is intended for keeping pH in a safe range, you could play with it and get exactly what pH you want with the assistance of a pH meter but I am judging this based on if a user DID NOT have access to a pH meter going on the test solution only.) The acid solution is very effective, which is nice, you don't want to use a lot of product to achieve results and end up being in need of more solution spending more $$$. I suggest using this 1-3 drop at a time, waiting 20 mins or so based on water flow and size of your container, and doing another test. Don't over do it, always undershoot what you are aiming for; you will save product and also prevent too acid/basic solution......just be patient, eventually you will understand the power of the acid/base solutions and wont even have to second guess if you put too much in or not. All in all, this is a must for a hobby hydroponic gardener or even a professional. Having a pH meter is nice, but some times the calibration may be off and having another testing method as provided in this kit is a good safety. I enjoy testing my solutions BOTH with the meter and the test solution because I know with out a doubt if my solution is within the correct pH range. This will last probably a year or even more depending on how big your system is. Just use sparingly and maybe play with the testing solution with known known acid/base solutions so you can take not of what the ACTUAL color of the liquid will look like in correspondence with the pH. Maybe put some vinegar in the vial, drop some test solution and take note. you will see a bright pink color. add some of the base solution and you will see the color change in the vial....do this before you mess with your actual nutrient solution just to get a feel for the colors! 5 stars for: price, reliability, longevity of the product use and ease of use. General Hydro is kind of the "big boss" hydro company and they really know what they are doing. Every product thus far I have purchased is good.

I was hesitant about trying the ph control kit, because I’m not much of a scientist, but it’s easy to use, and it makes a world of difference. Because I have city water, it’s too alkaline for my tender plants, and watering them with untreated tap water was taking a toll. I’ve been giving them ph balanced water and I can absolutely see the difference. They’re more vibrant and perky already - and it’s only been a week!

Test tube was crushed! Everything else was fine!

You can’t get a better product for the price, these are professional grade, hydroponic supplements at rock bottom prices. I accept no substitutes when it comes to my plants. They deserve the best I can get.

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 Circuitry The 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 Uptake Plants 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. PROS Absolute 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. CONS Subjective 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 Input The 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.

I’ve been using General Hydroponics pH Up and pH Down for maintaining the pH balance in my hydroponic nutrient reservoir, and I’m impressed with how reliable these products are. First off, the formulas are highly effective. A little goes a long way, which is great for precision adjustments without overcorrecting. Whether I need to raise or lower my pH, these solutions act quickly, giving me full control over the nutrient solution. One thing I really appreciate is how easy they are to use. Both products are well-labeled with clear instructions, making them beginner-friendly while still being ideal for experienced growers. They don’t cloud the water or interfere with nutrients, which is a big plus when you’re trying to maintain a stable reservoir environment. I’ve noticed that using these consistently has improved plant health. Maintaining the correct pH ensures that the plants absorb nutrients efficiently, and I’ve seen stronger growth and healthier root systems since adding GH pH Up and Down to my routine. If you’re serious about hydroponics, these are must-have tools. The bottles are durable and come in various sizes to suit any setup. Overall, I highly recommend General Hydroponics pH Up and pH Down for anyone managing a hydroponic system. They’re reliable, efficient, and worth every penny.

The tap water in Fairfax County, Virginia fluctuates between a pH of 7.8 and 8.0. I know right. It's insane. Before adding nutrients, I'm currently adding about 9ml pH down. After adding 2tsp each of the FloraSeries of nutrients (making a 5gal batch) for growing lettuce, my pH settles at 6.1. After three days of feeding 4 lettuce plants in a kratky setup, the pH drifts up to 6.5. Without some sort of pH control kit, there's no way I could grow hydroponically here.

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

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

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Excellent product I'll buy it again. Recommend

it’s so high price it’s not enough for one month