You want clear ammonia. No perfumes, no surfactants, nothing that will foam or fizz or wreck the bacteria you're trying to grow. That's Knock Out. 9.5% strength, clear as vodka, ready to dose straight from the bottle.
📦 Free 5ml dosing syringe in every box
🚚 Free UK delivery included
⚡ Dispatched from Huddersfield within 24 hours
500ml of Barrettine's Knock Out Household Ammonia. UK-manufactured cloudy ammonia at 9.5% concentration. No added fragrance. No surfactants. Just ammonia and water.
Why this bottle
Dr Tim's Ammonium Chloride works too. Knock Out costs less per dose and lasts you through your entire cycle plus every top-up for months afterwards. A 500ml bottle covers roughly 114 doses at 4 ppm in a 100 litre tank, or 67 doses in a 200 litre tank. You'll finish cycling with plenty left over for future maintenance or the next tank you set up.
How much do you actually add?
Use the ammonia dosing calculator. Type your tank volume, keep target at 2 ppm, get the exact ml. Rough guide for the impatient: 2.2 ml for a 3ft tank at 100L, 3.9 ml for a 4ft tank at 180L. Measure with the syringe from the box. Add near the filter output. Test after five minutes to confirm.
What else you'll want
An API Freshwater Master Test Kit to actually read your ammonia, nitrite and nitrate. An API KH/GH Test Kit for water hardness (axolotls need harder water than tropical fish, and knowing your baseline before cycling saves headaches later). A dechlorinator for water changes. The syringe is already in the box with the bottle.
Spec sheet
In the box: one 500ml Knock Out Household Ammonia bottle plus one 5ml plastic dosing syringe with 0.2ml graduations for precise measurement.
The ammonia: 9.5% ammonia solution, density 0.96 g/ml (roughly 91.2 mg NH3 per ml if you love the maths). Manufactured by Barrettine in the UK. Plastic bottle with tamper-evident cap. Store cool, away from direct sunlight. Keep away from children and pets. Do not mix with bleach.
