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General Hydroponics

General Hydroponics Ph Control Kit

  • Based on 29,965 reviews
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Availability: In Stock.
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Arrives Tuesday, Feb 10
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Size: Kit


Features

  • General Hydroponics pH Control Kit contains everything you need to measure pH levels of your hydroponic grow reservoirs
  • RELIABLE RESULTS: The streamlined testing system delivers fast, accurate, and easy-to read results every time
  • ALL-IN-ONE KIT: Includes 8 oz. General Hydroponics pH Up Liquid, 8 oz. General Hydroponics pH Down Liquid, 1 oz. Test Indicator, test tube, an eyedropper, and a pH level chart
  • THE PREFERRED WAY OF TESTING pH: Seasoned growers prefer our pH Test Kit to expensive electronic meters because of its reliability and ease-of- use
  • EASY TO USE: To use, simply fill a test tube halfway with nutrients, add a few drops of pH test indicator, and observe the coloration of the liquid; recommended pH for most plants is 5.5 to 6.5

Description

General Hydroponics® pH Control Kit accurately and efficiently measures the pH levels of your nutrient solutions, grow reservoirs, and the rest of your hydroponic system. pH control is essential for vigorous plant growth. Nutrient solution pH that is too high (basic), or too low (acidic), cannot be properly absorbed by plant roots. Incorrect nutrient solution pH can cause slow growth, sickly plants, and low yields. But General Hydroponics® pH Control Kit is here to help. The kit contains everything you need to test pH levels and make adjustments so you can easily monitor and manage pH levels throughout your hydroponic grow. Kit includes: 8 oz. pH Up, 8 oz. pH Down, 1 oz. test indicator, a test tube, eyedropper, and pH Level Chart. To maximize plant growth, the pH level of your nutrients should be slightly acidic. Experienced growers consider the ideal pH for most crops to fall between 5. 5 and 6. 5.

Product Dimensions: ‎1 x 1 x 1 inches


Item Weight: ‎1.5 pounds


Department: ‎Unisex-Adult


Manufacturer: ‎Hawthorne Hydroponics, LLC


Item model number: ‎HGC722080


Is Discontinued By Manufacturer: ‎No


Date First Available: ‎April 4, 2004


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Feb 10

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

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Top Amazon Reviews

    • works as advertised
Size: Kit
It's a Ph kit. It does what it is advertised to do and does it well. The test kit works great and often is quicker and easier to use than my digital meter. The color chart is built right onto the label of the test liquid so you can hold up the test tube and determine which color it matches or most closely resembles. ... show more
Reviewed in the United States on December 30, 2025 by Will
    • Good stuff
Size: Kit
Good product and value for the money you can test pH either with a pH tester or with the solution provided. This is a must have if you’re growing hydroponics will be purchasing again, though I feel this will last for a very long time.
Reviewed in the United States on December 12, 2025 by Alexa
    • Best way to test Ph levels
Size: 1-Ounce
The best arsenal I keep for correcting water Ph levels! GH delivers a very accurate and very dependable product every time. Highly recommend.
Reviewed in the United States on January 4, 2026 by Bigfysh93
    • Tried a true.
Size: Kit
Always good enough. The test "tube" I got was cracked but not enough to leak. Seems to be a common problem with these, not the first time this has happened. Good enough and doesn't need calibration or batteries.
Reviewed in the United States on November 10, 2025 by Todd William Fulton
    • Effective, reliable and reasonably priced....essential for a hydro system.
Size: Kit
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. ... show more
Reviewed in the United States on January 29, 2016 by Danni Boi
    • works great
Size: Kit
works great
Reviewed in the United States on January 21, 2026 by jeffrey sykes
    • Excellent product 😁
Size: Kit
Easy to use and accurate enough for my herb plants
Reviewed in the United States on December 27, 2025 by Joseph D Kelley
    • Easy to Use
Size: Kit
Very easy to use. Highly recommend.
Reviewed in the United States on January 26, 2026 by H.Howell

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