Vitalink – PH Down
- Vitalink – over 20 years experience
- pH Down– Decreases the pH of your nutrient solution
- Highly Concentrated – 50% Potassium Hydroxide
- Potassium Hydroxide – one of the best and most stable pH Down adjusters
- Corrosive – requires careful handling
- Available in 250ml & 1l
VitaLink ESSENTIALS pH Down is a concentrated acid (81% phosphoric acid) which can be used to adjust the pH of nutrient solutions. Use in controlled doses to adjust the pH level of nutrient solutions up. Mix thoroughly and measure with a calibrated pH meter to attain the desired pH reading.
When growing indoors, the pH value of nutrients fed to plants needs to be controlled. Plants are able to absorb nutrients more easily at a pH value of between 5.5 – 6.5. For plants to perform to their full potential pH will need to be monitored and adjusted at regular intervals (daily if possible). Adjust pH by adding a small amount of VitaLink pH Down to the nutrient solution, then recheck the pH value, repeat this until the pH reaches the value required
Caution: pH up and down can cause severe burns. Keep out of the reach of children. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice wear suitable gloves and eye/face protection. VitaLink pH Up and pH Down react violently if they come into contact with each other.
Never mix them together & never store them next to each other.
Use separate measuring equipment when adjusting pH values.
Conversions: 1 Teaspoon = 5mL | 1 Tablespoon = 15 mL | 1 Ounce = 30mL | 1 Cup = 240 mL
Introduction to pH
pH, or potential Hydrogen, is one of the most important parts of maintaining a healthy plant in a hydroponic garden. The pH level of the water in your hydroponic system directly effects how well your plants grow. An incorrect pH level will reduce or completely lock out the number of nutrients a plant can absorb. It could even kill your plants!
When it comes down to it, pH is the measure of the acid/alkaline balance of the water in your hydroponic system, also known as the nutrient solution. The pH level is measured on a scale of 0 to 14, with 0 being acidic and 14 being alkaline. A pH of 7 is neutral and most plants prefer a neutral pH, although some plants do better within a certain pH range.
To put it simply, you need a balanced pH in order for your plants to thrive. This guide will cover the basics of pH, how to check your pH, and how to adjust the pH in your hydroponic garden.
Why is pH important?
A balanced pH level is critical to the healthy growth of a plant. Without a balanced pH, the plant can not absorb nutrients essential to growth. In general, most plants prefer a pH between 5.0 and 7.5.
This chart will show you the availability of nutrients at different pH levels.
Checking the pH of your hydroponic system is a relatively straight forward process. There are three main methods used for checking the pH of your nutrient solution. I will cover all three in this guide.
The cheapest method involves paper test strips. The strips are covered in a pH-sensitive dye that will change colour when dipped in a nutrient solution. You then compare the strip to a colour chart to determine the pH. While inexpensive, this method isn’t very accurate and it can be made more difficult if you have a nutrient solution that isn’t clear. The colour of your nutrient solution may vary depending on the type of nutrients you’re using.
A liquid-based pH test kit is another popular option. This is one of the most popular methods, as it is a bit more accurate than the paper test strip method. To use a liquid test kit, simply add a few drops of pH-sensitive dye to a small vial with containing your nutrient solution. The colour of the nutrient solution will change, which you will then compare to a colour chart to determine the pH level. As the test strip method, I don’t recommend using the liquid method if the colour of your nutrient solution has changed because of your nutrients.
The most effective way to check your pH is with a digital pH meter. Digital meters come in numerous sizes and price ranges depending on the features included. A digital pH pen is a commonly used pH reading tool for the hobby gardener. They are extremely easy to use – Simply insert the electrode tip of the meter into the nutrient solution until a pH reading is displayed on the screen.
It is important to keep your electronic pH meter properly calibrated. This is the most important thing to remember if you own an electric meter. Some meters require the glass electrode to be kept wet at all times, so some meters will come with a storage solution that you rest the tip of the meter in when not in use.
This type of meter also needs to be calibrated often, which is simple to do. You will need a calibration solution in order to calibrate your meter. Calibration directions vary from brand to brand, but generally, you just insert the top of the meter into the calibration solution and adjust the calibration setting on the meter until the reading on the display matches the pH of the calibration solution.
We highly recommend keeping an extra pH meter on hand, as they have a tendency to break down without warning. Given how important your pH is, you don’t want to be caught without the ability to check your pH.
Adjusting pH levels
Adjusting the pH of your nutrient solution is very easy to do. You will need a pH up and pH down solution. If you need to raise or lower your pH, then add some pH up or down to your nutrient solution. Allow the adjustment solution to properly diffuse and circulate throughout your system before re-measuring the pH of your nutrient solution.
We recommend checking the pH of your nutrient solution once a day, although you may be able to check it less often depending on some factors. The pH in each system will fluctuate, some more quickly than others. Factors such as your water source, grow medium, and nutrients can affect the rate at which your pH fluctuates.
“Vitalink pH up does exactly what it says on the label and does it well, Very strong use with care.”
“Be aware there are no specifications on the bottle on how much to add to how much water. I contacted the guys at gone to pot, but also googled it, feeling like an idiot afterwards. So it varies greatly, you HAVE to have some way of measuring the pH to be able to use this, a pH pen or similar, but if you buy this product, you probably already have this. It is NOT enough to have one of those sticks to push into the soil, you need to know the pH of the water before you feed it to your plants. To get the right pH, I measured the water with a pH pen, used one of those syringes you get from the pharmacy for measuring out Calpol and similar, they have 5ml, 2.5ml and 1ml syringes. I used a 5ml one, but you can easily use the smallest one, as you don’t need a lot. Put in a tiny ammount. I put in approx 0.5ml to 5L of water, and that took the pH down by over 1. So just do tiny tiny amounts at a time, too little > too much. And use gloves! I also learned after buying this product that you rarely need to pH up soil, it naturally rises, so you only really need the pH down, normally. But hey ho, now I have both! :) Thanks to the staff at gone to pot for getting back to me so quickly, a-ok service there!”
“Items arrived very fast, no leaks, well packaged. These chemicals are extremely potent, be sure to wear PPE such as gloves and do not in hale or spill. Since you may find yourself needing to use 1ml or less, a syringe is best paired with this product. It will last a very long time for normal household products.“
With over 20 years’ experience in the industry, VitaLink is a veteran in the hydroponic market. Made in Coventry, England and formulated using exceptionally high-quality ingredients which are stable in solution, VitaLink products are highly beneficial for your crop.
During 2015 VitaLink was rebranded. The rebranding had a mixed reception initially, 2 years later VitaLink saw a record-breaking year and has grown increasingly popular across the global markets we operate in.
We go through a strict registration and quality check process which means all our products are registered and regulated by the necessary authorities. Consequently, when using VitaLink products you can be reassured you’re using a tried and trusted product.
We strive for the best possible results, so you don’t have to. We have products that cater to every growing style; Hydro, coco or soil, so if you’re considering giving growing a go, use the VitaLink range. Unsure about our products? Navigate your way around our website and find all the info you need!