Nothing matches all of those filters.
pH up, pH down and conditioners
Moving the tank into range, and holding it there once it is.
Cal-Mag and calcium supplements
What soft water and reverse osmosis water leave out.
Meters, dosers and controllers
Reading pH and EC, and in the case of the controllers, correcting them for you.
Bluelab PeriPod M3 Automatic Nutrient Doser
- pH dosing pump 1x peristaltic, 120ml/min (4fl oz/min)
- Nutrient dosing pumps 2x peristaltic, 120ml/min (4fl oz/min)
- pH tubing 4 metres (13ft) acid/alkaline resistant food-grade
- Nutrient tubing 3x 4 metres (13ft) food-grade
Bluelab Pro Controller Wi-Fi pH and EC Automation
- Brand Bluelab
- Measures pH, conductivity and temperature
- Monitoring Continuous, 24/7
- Connectivity Built-in Wi-Fi, integrates with Edenic.io, can be...
Essentials pH Meter for Hydroponic Nutrient Solution
- Range 0.0 to 14.0 pH
- Resolution 0.1 pH
- Accuracy +/- 0.2 pH
- Battery 4 x 1.5 V button cell
Milwaukee pH51 Waterproof pH Meter for Nutrient Solutions
- Brand Milwaukee
- Type Meters
- Price from £41.49
- Availability In stock
Water Conditioning Toolkit
- EC meter Bluelab Truncheon Nutrient Meter V2
- pH testing Aqualine pH Stick
- pH adjustment Growth Technology pH Up and pH Down
- Water treatment Ecothrive Neutralise (chlorine and chloramine)
Probe care and calibration
Buffer solutions, storage fluid and cleaner. A probe reads wrong long before it reads nothing.
Single elements and trace
One element at a time, for correcting a shortage without lifting the whole feed.
The full range
pH up, pH down and calibration for grow tents
Nutrients only become available to the plant within a fairly narrow pH window, so a feed that's perfectly mixed but sitting outside range is close to wasted. Coco and hydro growers should be aiming for pH 5.8 to 6.2 at the root zone; soil is more forgiving at 6.0 to 6.5. Check pH after mixing nutrients, not before — adding concentrate always shifts the reading, sometimes by half a point or more.
Canna pH Down is a bloom-specific acid concentrate that plays nicely with Canna's own base feeds; most pH down products work fine across brands as long as you dose gradually. Meters drift over time, which is why Growth Technology Buffer 4 and Buffer 7 calibration solutions matter — recalibrate a digital pH pen roughly every two to four weeks, or immediately if readings start looking off compared to a fresh mix.
What's on the shelf
- Growth Technology — Buffer 4 and Buffer 7 calibration fluid, plus Liquid Silicon for buffering pH swings at the root.
- GHE — Flora Kleen, a reservoir and root-zone cleaner that also helps correct pH drift caused by salt build-up.
- Canna and Ecothrive — pH Down (bloom), Cal-Mag Agent for hard water, and Neutralise for stripping chlorine and chloramine from mains water before it hits the reservoir.
If you're topping up a hydro reservoir daily, water can drift half a point or more overnight as roots take up nutrient unevenly — check first thing each morning rather than trusting yesterday's reading. Pair a meter from meters with your calibration fluid, and see base feeds for the nutrients you're actually correcting pH for.
Express Delivery available, free over £60. Ring the shop on 020 3488 0419 for advice, six days a week.