General Hydroponics pH Down Liquid is formulated using food grade Phosphoric acid to create a premium solution for maintaining and lowering a nutrient's pH. Just add a little at a time if your nutrient pH is too high in order to lower the pH to the proper level.
Achieve the perfect pH
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. Users of General Hydroponics nutrient products generally do not experience problems maintaining the proper pH range because our formulas are pH buffered. However, some important exceptions do exist. pH can acidify to an unacceptable level when nutrient solutions are used with poor quality water, or pH unstable media, such as rockwool. High growth rates can also destabilize pH.
Use sparingly - add to nutrient solution, a little a time, then test pH. Repeat application, then test, until desired pH is achieved. The quantity necessary for pH adjustment will vary depending on the strength of the nutrient and the purity of the water used to mix nutrient.
This product lowers nutrient pH. Recommended pH for most plants is 5.5 to 6.5.