Search  for anything...
API

API TAP WATER CONDITIONER Aquarium Water Conditioner 16-Ounce Bottle

  • Based on 20,439 reviews
Condition: New
Checking for the best price...
$8.48 Why this price?
Save $3.50 was $11.98

Buy Now, Pay Later


As low as $2 / mo
  • – 4-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Apple Pay, and PayTomorrow. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: In Stock.
Fulfilled by Amazon

Arrives Monday, Apr 13
Order within 4 hours and 31 minutes
Available payment plans shown during checkout

Protection Plan Protect Your Purchase
Checking for protection plans...

Size: 16 oz


Color: White


Features

  • Contains one (1) API TAP WATER CONDITIONER Aquarium Water Conditioner 16-Ounce Bottle
  • Neutralizes chlorine, chloramines and other chemicals to make tap water safe for fish
  • Prevents tap water chemicals from causing gill destruction, tissue irritation and fish death
  • Super strength, high concentration formula
  • Use when adding or changing water and when adding new fish to freshwater and saltwater aquariums
  • Add 1 ml. for each 20 gallons of aquarium water.

Description

Good water quality is the key to a healthy, beautiful aquarium. Tap water contains chemicals, such as chlorine and chloramines, which make water safe for drinking, are highly toxic to fish. High levels of these chemicals destroy fish gill tissue, preventing the uptake of oxygen which can lead to fish death. Even low levels irritate delicate fish tissue. Tap water must be treated before adding fish to make sure fish remain healthy. API TAP WATER CONDITIONER Aquarium Water Conditioner instantly removes chlorine and neutralizes chloramines. It also detoxifies heavy metals in tap water. The formula of API TAP WATER CONDITIONER incredibly concentrated. You only need up to 3 ml to treat 10 gallons of water. It's safe for all aquatic and can be used in both fresh and salt water. Use during aquarium set up, water changes and adding fish. With API aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too.

Brand: API


Liquid Volume: 16 Fluid Ounces


Item Weight: 1.2 Pounds


Item Form: Liquid


Manufacturer: Mars Fishcare


Is Discontinued By Manufacturer ‏ : ‎ No


Product Dimensions ‏ : ‎ 2.5 x 2.5 x 8.75 inches; 1.2 Pounds


Manufacturer recommended age ‏ : ‎ 1 month and up


Item model number ‏ : ‎ 52C


Department ‏ : ‎ Unisex-Adult


Date First Available ‏ : ‎ June 20, 2004


Manufacturer ‏ : ‎ Mars Fishcare


Best Sellers Rank: #692 in Pet Supplies (See Top 100 in Pet Supplies) #2 in Aquarium Water Treatments


#2 in Aquarium Water Treatments:


Item Weight: 1.2 pounds


Department: Unisex-Adult


Manufacturer: Mars Fishcare


Item model number: 52C


Date First Available: June 20, 2004


Item Package Dimensions L x W x H: 8.5 x 2.4 x 2.34 inches


Item Dimensions LxWxH: 2.5 x 2.5 x 8.75 inches


Item Weight: 1.2 Pounds


Brand Name: API


Target Audience Keyword: fish


Directions: Use when setting up an aquarium, and when adding or changing water. Using dosing cap on bottle, add 1 ml for each 20 gallons (76 L) of aquarium water to remove chlorine and heavy metals. To detoxify chloramines, add 5 ml for each 30 gallons (114 L) of aquarium water. Tip heavy metals, such as copper, lead, and zinc, can be found in most tap water supplies. These metals are toxic to tropical fish. So treat the aquarium when adding tap water.


Country of Origin: United States


Model Name: TAP WATER COND. 16 OZ.


Color: White


Size: 16 oz


Material: Plastic


Number of Items: 1


Style: Aquarium Treatment


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Apr 13

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • A Must-Have for Aquatic Health!
Size: 16 oz Color: White
I’ve been using API TAP WATER CONDITIONER for a few weeks now, and I’m extremely impressed with its effectiveness in keeping my aquarium water clean and safe for my fish. Here’s why I’m giving it a 5-star review: 1. Perfect for New Aquariums and Water Changes: I’ve recently set up a new tank, and this conditioner has been a lifesaver. It quickly removes harmful chlorine, chloramine, and heavy metals from tap water, which could be toxic to fish. It ensures the water is safe to use without waiting for the water to sit for days. 2. Safe and Effective for All Fish Species: Whether I’m adding new fish to my tank or doing a routine water change, I feel confident using this product. It’s safe for all types of freshwater fish, including my delicate species. I haven’t noticed any signs of stress in my fish after water changes, which speaks volumes about the quality of this conditioner. 3. Easy to Use: The API TAP WATER CONDITIONER is super easy to use. I simply add the recommended amount per gallon of water, and it instantly works its magic. No hassle, no mess—just pour and go! 4. Great Value for Money: Considering the price and the amount of product you get (16 ounces), this conditioner is a great value. It lasts for a long time since you only need a small amount with each water change, making it an affordable option for any aquarium owner. 5. Fast Acting: The conditioner works fast! I can fill the tank with treated water and immediately begin acclimating new fish. I’ve had no issues with cloudy or unsafe water when using this conditioner, and it’s consistently kept the water quality at its best. 6. Trusted Brand: API is a well-respected brand in the aquarium industry, and it’s a name I trust when it comes to my fish’s health. Their products are always reliable and effective. Final Thoughts: If you’re an aquarium owner, whether you’re new to fishkeeping or a seasoned pro, I highly recommend the API TAP WATER CONDITIONER. It’s safe, affordable, and does exactly what it promises—ensures clean, safe water for your fish and keeps them happy and healthy. 💯 Five stars – a must-have for any aquarium enthusiast! ... show more
Reviewed in the United States on February 17, 2025 by Tino Bruno

  • Excellent value. Have been using for years. Would never buy anthing but this.
Size: 128 oz. Color: multi
I swear by this stuff. It's perfect for water changes. I use it in all my aquariums and in my pond. I never mix water first. I just do it in the tank. I do add water slowly though. It has no smell or color. It works very fast. It is highly effective. I add one cap full for every 30 gallons of water in my tank and it always works. It says add such and such for every gallon that you add, but I do the math by the water volume of my tank since I am adding tap water directly to my tank. A couple of drops is all you need for a gallon if you are only topping it off. I do about 70% water changes biweekly using this stuff. If you are having dead fish most likely the issue is because of temp, adding it too fast, or you just need to add more. I have even added way more than it needed by accident. It had literally no effect on my fish or plants at all. Very hard to overdose your tank unless you dump in the whole bottle. I do wear gloves when using this product. Can't be too careful. And eye protection too. ... show more
Reviewed in the United States on November 4, 2025 by Mike

  • Healthier water for healthier plants
Size: 16 oz Color: White
Looking forward to healthier and happier plants. Going by all the reviews, this product seems to stand the test of time. I haven’t used it yet, but I’m certain it is much more effective, and of way higher quality, than tap water. No smell. And the cap has a 1 mL measurement which is really nice for me, since I use gallon, or less, containers, for watering. Great expiration date for lasting a long time. ... show more
Reviewed in the United States on February 5, 2026 by MissConnieLove MissConnieLove

  • My Go-To Water Conditioner for Every Water Change
Size: 16 oz Color: White
The media could not be loaded. I love this API water conditioner because it does exactly what it promises. It instantly neutralizes chlorine and chloramines, which gives me peace of mind during water changes. I’ve noticed my fish are more active and the water stays clear. Plus, it lasts a long time since you only need a small amount. Definitely a must-have for any aquarium. ... show more
Reviewed in the United States on January 31, 2026 by Yeymi Maria Guido Reyes Yeymi Maria Guido Reyes

  • Awesome Product-Funky Smell
Size: 16 oz Color: White
I bought this water conditoner for my betta tank. It does a great job and conditioning the water, and the measuring cap comes in handy. This stuff doesn't detoxify ammonia and nitrite like Seachem Prime does, but still gets the job done for my betta. It is a huge bottle that can last forever as well! The only thing is the smell is kinda funky, like boiled eggs. However, this is a great budget conditioner! ... show more
Reviewed in the United States on October 8, 2025 by JP

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...