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Greens Horticulture - Serving Growers All Over The UK

GT pH Down and pH Up

Regular price £2.66 £2.95 | Save £0.29 (9% off)
Tax included. Shipping calculated at checkout.
In Stock
SKU: 2656
Spend £50.00 more for free delivery (shipping surcharges still apply)

GT pH Down and pH Up

pH Up / 250ml - £2.66
  • pH Up / 250ml - £2.66
  • pH Up / 1l
  • pH Up / 5l
  • pH Down (30%) / 1l
  • pH Down (30%) / 5l

GT pH Down and pH Up


The pH levels in all hydroponics systems need to be carefully monitored and controlled. This also applies when using soil or coco coir as your medium - although both mediums are more forgiving than growing hydroponically, getting it right could mean the difference between average or bumper, maximised yields come harvest time.

The ideal pH range of nutrient solutions in a hydroponic set-up should be somewhere between 5.6 and 6.2. In soil this optimal range is around 5.8-6.5, and in coco coir you're looking for somewhere in between 5.5-6.5, with an overall average of around 5.9 throughout the grow cycle. pH levels can easily be controlled with the help of either a pH up or pH down solution.

If your pH levels are outside the recommended range then your system is at a high risk of causing harm to your plants. At the very best the performance of your plants will suffer and at worst your plants will die, especially if they are left outside the optimum range for too long.

Both pH Up and pH Down are highly concentrated aggressive liquids and should be handled with extreme care. Please wear gloves and eye protection!

pH Down:

This pH Down solution contains phosphoric acid which will quickly and effectively act to reduce the pH of your nutrient solution. The formula was recently diluted to the maximum strength legally allowed, which is 30% concentration.

pH Up:

This pH Up solution contains potassium hydroxide at a concentration of 25%, which is again stronger than most other pH Up solutions on the market. This formula will act quickly to raise the pH of your nutrient solution back to an optimum level.


***Health and safety***

These solutions are highly concentrated aggressive liquids and the manufacturer recommends exercising the following precautions:

  • Wear gloves and eye protection when handling and administering
  • Store safely and keep out of reach of children

Available in 250ml, 1l and 5l sizes.

Important notice: pH Up and pH Down solutions can only be sent to mainland UK addresses. We cannot ship this product to any offshore destinations due to the International Maritime Dangerous Goods (IMDG) code. If youre unsure about whether we can ship this product to your address then please give us a call on 0117 971 3000 to find out.


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Delivery Information

Most orders are shipped within 24 hours.

Orders are currently shipped with Parcelforce (Express 24 service for standard and heavy/bulky items) or DPD Local (Premium next-day), a signature will be required on delivery. We have been shipping orders for 15 years and our courier choices are subject to change as service levels fluctuate.

All orders are shipped on a next day courier service – you will be informed via email or SMS the evening your order leaves us so you know to expect it the next day. On the morning of delivery you will get another SMS or email informing you of the expected delivery time.

If you have any questions on delivery please get in touch.

As the website calculates some charges by weight it is possible that shipping is not calculated correctly. We reserve the right to get in touch in these circumstances we will request the additional amount or offer to refund the order.

UK Delivery

Standard delivery to the UK Mainland addresses (excluding Scottish Highlands & Islands, offshore and N.I.) is charged at a flat rate of just £5.95 per order or £7.95 (for the premium next-day service), standard delivery (with Parcelforce) is free* for orders over £50.

*Large and/or heavy items attact a surcharge from our courier - shipping surcharges are calculated per item and are applied regardless of order value.

Non-UK mainland destinations are charged by weight.

International Delivery

Coming soon…

Collect in Store (Bristol)

We now offer a 'collect in store' option, which allows you to pay for goods online and collect from our Bristol store at time that suits you (within our opening hours).

The process is simple:

  1. place your order and pay online, select 'Pick Up' at checkout;
  2. receive an email confirming that the order is ready for collection;
  3. bring/show your confirmation email and photo ID to collect your order.


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