{
  "id": "ph-up-and-down",
  "sku": "ph-up-and-down",
  "title": "pH Up and Down Control Kit with Test Strips",
  "slug": "ph-up-and-down",
  "price": 106.99,
  "currency": "NZD",
  "availability": "in_stock",
  "category": "accessories",
  "category_label": "Accessories",
  "tags": [],
  "colors": [],
  "materials": [],
  "dimensions": null,
  "weight": null,
  "images": [
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    "https://nfthydroponics.co.nz/dropship-images/accessories/ph-up-and-down/ph-up-and-down-4.jpg"
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  "description_short": "Two 250 ml concentrated solutions, a measuring cup, a dropper, pH test strips and a colour chart, so you can check your water and nudge it where your plants want it.",
  "description": "The problem nobody warns you about\n\nYou mix your nutrients carefully. You measure everything. The plants still look sulky, the new leaves come through pale, and nothing you add seems to help. Most of the time, the issue is not what is in the water. It is the pH of the water.\n\nPlant roots only take up nutrients across a certain band of acidity. Push outside that band and the nutrients are still sitting there in the tank, perfectly measured and completely unavailable. Iron locks out first, then other trace elements, and you end up feeding more of something the plant cannot actually use. It is a frustrating problem precisely because it looks like a feeding problem.\n\nA pH up and down kit is the fix, and it is a small one. Two bottles, a way to measure a dose, and a way to check the result. That is the whole job.\n\nHow pH adjusters actually work\n\nThe pH scale runs from very acidic to very alkaline, with neutral in the middle. Most tap water sits somewhere on the alkaline side, and most plants grown in water or in a soilless medium prefer things a bit more acidic, usually somewhere between 5.5 and 6.5.\n\npH Down lowers the reading. In this kit it is formulated with phosphoric acid, which is one of the common choices for a hydroponic pH adjuster. It brings the number down and also contributes phosphorus, which plants use anyway.\n\npH Up lifts a reading that has dropped too far. This one uses buffering agents. You will reach for it less often if your tap water is hard, but coco coir growers and anyone running a reservoir for several weeks will find they need it.\n\nBoth bottles are concentrated. The guide dose is about 3 ml per litre, which means a small squeeze does real work. That is good for economy and bad for anyone with a heavy hand, which is why the dropper in the box matters more than it looks.\n\nWho this kit suits\n\nIf you grow herbs, leafy greens or vegetables in any kind of water-based or container system, you are the target buyer. Deep water culture tubs, drip systems, nutrient film setups, coco coir pots, raised beds watered by hand, aquaponic tanks and a tray of basil on a kitchen bench all respond to pH.\n\nBeginners get the most immediate value, because the kit bundles the testing and the adjusting together. You are not trying to work out which bottle to buy first and which strips match which chart. Experienced growers tend to keep a kit like this as a backup even if they run a meter and buy larger bottles, simply because it is handy to have both directions covered.\n\nIt suits anyone whose water has been diagnosed as the problem. If you have ruled out light, temperature and feeding and still have odd leaf colour, pH is the next place to look.\n\nChoosing the right approach for your setup\n\nThree things decide how you should use a pH control kit: your water, your volume and how often you change your solution.\n\nStart with your water. Fill a jug, test it with a strip, and write the number down. That single reading tells you which bottle you will mostly use. Hard water from the mains usually means pH Down does the heavy lifting. Rainwater or filtered water can swing the other way.\n\nThen think about volume. A twenty litre reservoir and a two litre jug need very different doses. Working from the 3 ml per litre guide, a small jug might need under a millilitre, which is a dropper job. A reservoir is where the measuring cup earns its keep, because you can pre-measure a dose and add it in one go rather than pouring blind.\n\nFinally, consider how often you top up or change. Systems that get topped up with fresh water daily will drift daily, because you are adding untreated water to a treated tank. Systems that get a full change every week or two are steadier between changes but swing harder at changeover. Neither is wrong, but the first needs more frequent small corrections.\n\nA quick word on the strips. They give a colour-coded result against the included chart, which is quick, portable and perfectly adequate for everyday checks. They are a visual comparison rather than a precise instrument, so if you are running a bigger system or chasing a specific target, a pH meter alongside the strips gives you the best of both. The strips become your fast check, the meter becomes your reference.\n\nDosing without overshooting\n\nHere is the routine that saves the most frustration.\n\nMix your nutrients into the water first. Nutrients change pH, so adjusting before you add them is wasted effort. Stir properly and give it a minute to settle.\n\nTest with a strip and compare it to the chart. Decide which direction you need to move.\n\nAdd a small dose. Smaller than you think. For a bucket, a few millilitres from the dropper. For a reservoir, measure into the cup and pour it in while the water is moving or stir it through.\n\nWait. Five minutes is a reasonable pause for the solution to distribute. Then test again.\n\nRepeat if needed. Two or three small steps will always beat one confident pour, and you will not end up reaching for the other bottle to undo your own work.\n\nIf you overshoot, do not panic and do not dump the tank. A tiny amount of the opposite solution will bring it back. Just go even slower on the way back.\n\nHandling and storage\n\nThe pH Down solution contains phosphoric acid, so treat it with respect. Wear gloves. Keep it off your skin and away from your eyes. Work over a sink or a tray where a spill is easy to wipe up, and rinse anything that gets splashed with clean water.\n\nBoth bottles need to be kept out of reach of children and pets, stored well away from food and drink. Cap them tightly, keep them upright, and park them somewhere cool and dark. Direct sun on a shelf is not where these belong.\n\nShake each bottle before you use it, as the listing advises. Rinse the measuring cup and the dropper with clean water after every session and let them dry. Keep the test strips sealed and dry, and handle them with dry fingers, because damp strips give you a reading you cannot trust.\n\nCommon mistakes worth avoiding\n\nAdjusting before adding nutrients is the big one, and almost everybody does it once.\n\nChasing a single decimal point is another. A stable reading inside the band is far better for plants than constant fiddling to hit an exact number. If your solution sits at 6.1 and stays there, leave it alone.\n\nIgnoring run-off in coco coir is a third. The water going in is only half the story. What comes out the bottom tells you what the root zone is actually experiencing.\n\nAnd using tired strips. They are cheap to replace and they are the one part of the kit that quietly degrades if they get damp. If the colours look washed out, get fresh ones.\n\nThe short version\n\nYour plants can only eat what the water lets them reach. This kit gives you both bottles you need, a cup and dropper so you can dose small, and strips with a chart so you can see what you have done. Mix nutrients first, test, add a little, wait, test again.\n\nGloves on for the pH Down, bottles capped and out of reach of children, and a note somewhere of how much your particular tap water needs. Do that once and the rest becomes routine. Most growers find pH is the easiest big problem they ever fix.",
  "llm_summary": "This is a two-part pH control kit for home growers, supplied as one 250 ml bottle of pH Up and one 250 ml bottle of pH Down. The pH Down solution is formulated with phosphoric acid, and the pH Up solution uses buffering agents. The kit also includes a measuring cup, a dropper, pH test strips and a colour chart for checking readings. The listed guide dose is about 3 ml per litre, added gradually with re-testing between doses, and the suggested working range is 5.5 to 6.5. It is described as suitable for hydroponics, coco coir, soil gardens, aquaponics and indoor or outdoor pots. Brand is GIDIGI, model GX-pHControl. Weight, dimensions, colour, material and country of origin are not specified in this record.",
  "returnable": true,
  "return_policy": "Change-of-mind returns accepted for 15 days from purchase under this shop's own published policy: original packaging, proof of purchase, buyer pays return postage. The consumer guarantees of the Consumer Guarantees Act 1993 apply to faulty or misdescribed goods, with repair, replacement or refund and return postage covered by the shop.",
  "shipping_profile": "standard",
  "warranty": null,
  "brand": "Hydroponics Company New Zealand",
  "gtin": null,
  "mpn": null,
  "condition": "new",
  "url": "https://nfthydroponics.co.nz/product/ph-up-and-down/",
  "canonical_url": "https://nfthydroponics.co.nz/product/ph-up-and-down/",
  "json_url": "https://nfthydroponics.co.nz/api/products/ph-up-and-down.json",
  "updated_at": "2026-11-08",
  "compare_at_price": 127.99
}