Growth Technology pH+ & pH-

In stock online
Standard Delivery £6.95*
Free Delivery - orders +£65 Free Delivery - orders +£65
Plain Packaging Used Plain Packaging Used
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Product Name Qty Price
Growth Technology pH Up - 250ml
Growth Technology pH Up - 1L
Growth Technology pH Down - 250ml
Growth Technology pH Down - 1L
Growth Technology pH Down - 5L
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Using the correct pH in your nutrient solution is essential, too low or high and it could have a detrimental effect on your plants, so ideally the level should be between 5.8 – 6.2.

When mixing up nutrient solutions, pH can fluctuate, or the water being used has a naturally low pH, but with just a couple of drops of Growth Technology’s pH Up or Down, it can change the pH to a more acceptable level, and one that your plants will love you for.


  • The formula is highly concentrated so only a few drops can dramatically change the pH, therefore its recommended that a small amount is diluted in just a few milliliters of water first, then added to your nutrient solution drop at a time.
  • NEVER use pH Up and pH Down together. If you’ve accidentally used too much pH Down, DO NOT use pH Up to correct the problem and vice versa. If this happens, we recommend you dispose of the solution and make a fresh batch as mixing pH Down and pH Up can have a chemical reaction and render the nutrient solution unusable.
  • With pH Up being 25% Potassium Hydroxide, and pH Down being 81% Phosphoric Acid, extreme care should be taken when using them. If it comes into contact with skin, eyes, clothing or even swallowed, rinse with clean water immediately and always read the safety notes before use.
  • You should also make sure that your pH meter or pen is kept clean, rinse between use and regularly calibrate it using a known pH liquid, such as Buffer 7, so it always reads accurately.
Delivery & Returns
Free Delivery
We are pleased to offer free standard shipping to UK Mainland on all orders over £65.00 *Heavy item surcharges are still applicable.
Next Day Delivery
In a hurry for your order? Order before 1 pm Mon - Thurs for next working day delivery *subject to stock availability T&C's apply.
Different delivery address?
Do your goods need shipping to an alternative address? If so, paying by bank transfer gives you the freedom to have them delivered to anywhere in the UK.
Free Returns
Faulty or damaged item? No problem, contact us on 0800 038 7100 or email customer service and we can arrange a free collection.
Plain Packaging
All parcels, no matter how big or small, are dispatched in plain packaging using black wrap that's secured using 'fragile' tape.
How to Pay
Credit / Debit Cards
We accept all major credit and debit cards. Please note: When paying by credit card we can only ship to the card statement address.
Simply select this option at checkout if you prefer to pay through PayPal. Please note: When paying by PayPal, we can only ship items to the account owners confirmed address.
Bank Transfer
Select the option for Bank Transfer at checkout if you wish to receive your item anywhere within the UK. Please use your order number as payment reference.
Split your purchase into manageable payments. Buy now and pay in 30 days or in three interest-free instalments with Klarna.
Click & Collect
Collect your online orders in as little as under an hour*! Simply pay online, choose your store & collect for free! Available from Manchester & Huddersfield (*subject to stock availability).
Brand Growth Technology
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