API Stress Zyme Biological Water Treatment - Petdirect
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API Stress Zyme Biological Water Treatment

by API
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Description:

API® STRESS ZYME bacterial cleaner contains over 300 million live bacteria per teaspoonful to consume sludge and reduce aquarium maintenance, keeping your aquarium clean and improving the natural aquarium cycle. 

Making STRESS ZYME bacterial cleaner part of your tank’s regular upkeep routine assures an active biological filter, a cleaner aquarium, healthier fish, and good water quality. This product may be used in both fresh and saltwater aquariums.

Key Benefits:

  • Helps reduce toxic ammonia and nitrite.
  • Helps clean a dirty aquarium.
  • Contains over 300 million live bacteria per teaspoonful.
  • Contains 5 beneficial bacteria strains, each specifically selected for its unique role in the development of the biological filter. 
  • Safe for all fish, invertebrates, and aquarium plants. 
  • Safe to use alongside all API aquarium products.

30mL bottle treats up to 227L, 118ml up to 893L, 237ml up to 1,794L

Directions:

Shake bottle before use.

*if dosing in saltwater aquariums, it is not recommended for use with a protein skimmer

Dosage:  5 mL per 38 L of aquarium water. 

Use at every water change, during filter maintenance or filtration media replacements.

Dose weekly to support the natural biological health of your aquarium.
 

For new aquariums:
Day 1 add double the dose to 10ml per 38L, repeat on Day 7 and Day 14  before moving to the standard maintenance dose rate. 

Store in it's closed container in a dry and cool area. Always follow the instructions on the product label for safe and effective use.

 

All orders are dispatched from Petdirect’s Auckland and Christchurch warehouses, offering fast, reliable delivery throughout New Zealand.

Standard Shipping
  • Next working day delivery for most main centres
  • 2 business days to regional areas
  • 3 business days to rural addresses

Free shipping on orders $79.00 and over
Flat $5.90 delivery for smaller orders

Evening Express

This is ideal for urgent pet supply needs within the Auckland and Christchurch regions.

Available in eligible Auckland and Christchurch suburbs only.

  • Same-day delivery if you order before 2pm Monday–Friday.
  • Cost is $15.95 per order.
  • Orders placed after 2pm or during weekends/public holidays will be delivered the next business evening.
  • Eligible addresses can select evening express shipping at checkout.

See our shipping & delivery page for more information

You have 30 days to return products in original condition if you change your mind. Courier costs apply for change-of-mind returns.

If we made a mistake or your order is faulty or damaged, we’ll make it right — and cover the return shipping.

In-person returns are welcome at our Auckland store or Christchurch warehouse (by appointment).

See our full returns & refunds policy for more detail