

💧 Transform your tap water into a fish-friendly oasis—fast, safe, and foolproof!
API TAP WATER CONDITIONER is a premium 16-ounce liquid formula designed to instantly neutralize chlorine, chloramines, and heavy metals in tap water, making it safe for all freshwater and saltwater aquariums. Its super concentrated formula requires minimal dosage, ensuring fast, effective water treatment during setup, water changes, or fish introductions. Trusted by over 24,000 users with a 4.7-star rating, it guarantees a healthy, irritation-free environment for your aquatic pets.













| Brand | API |
| Customer Reviews | 4.7 out of 5 stars 24,030 Reviews |
| Item Form | Liquid |
| Item Weight | 1.2 Pounds |
| Liquid Volume | 16 Fluid Ounces |
| Manufacturer | Mars Fishcare |
| UPC | 017163003526 |
T**O
A Must-Have for Aquatic Health!
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!
M**E
Excellent value. Have been using for years. Would never buy anthing but this.
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.
S**S
Great for plants too
It is intended for aquariums, but it works well for watering my plants as well. The tap water in Vegas is downright awful and my house plants have been SO happy with this little addition to their water. I like not having to buy gallons and gallons of distilled water; I can save that for the plants that actually need it. It's also very easy to use, I just use a little plastic pipet to add the amount needed.
M**W
Affordable, and Effective Water Conditioner
I’ve been using API Tap Water Conditioner for years, and it has consistently delivered great results. For me, it’s the perfect balance of effectiveness and price, it works just as well as higher-end brands, but at a fraction of the cost. A 16oz bottle lasts me around 5 months while maintaining two aquariums (a 20-gallon and a 40-gallon), which makes it an incredible value. The built-in measuring cap is a simple but very handy feature, it takes all the guesswork out of dosing. My routine is to add half the recommended dose while refilling the tank and the other half once it’s completely filled. In all the time I’ve used this conditioner, I’ve never had a single issue with water quality or fish health related to tap water treatment. It’s easy, dependable, and budget-friendly, exactly what I want in a staple aquarium product. Highly recommended for any fishkeeper.
J**P
Awesome Product-Funky Smell
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!
B**S
Best Ever!
I have had fish as long as I can remember. I have had my share of different tanks and filtration systems. A few months ago my tank was becoming extremely cloudy within days of water changes. Never had a problem as severe as that. I was blaming it on the towns water source and was at my wits end trying to keep it clear. I have never used a water conditioner before and decided to give it a try. I found this API Tap Water Conditioner and liked the reviews. Two days after my first use my water became more clear than I have ever seen it. Not only did it clear the water perfectly, it has stayed clear for over a month now. Will never do a water change again without using this conditioner.
G**T
The best value for tap water treament
I love all of the API products, especially their easy to use test kits. This product is great as well. Regardless of which size you buy of their tap water conditioner, it is the best value of reputable brands that will treat all tap water for your pond or tank. It only requires 3 drops per gallon you add to your tank. It removes chlorine, neutralizes chloramines, and helps detoxify any heavy metals in your tap water. Some more expensive products will claim to also include things to help your fish maintain their protective slime coating (and cure male pattern baldness and perhaps ED). If your fish are healthy, and your tank's water parameters are maintained well through weekly water changes and good filtration, those other ingredients are useless. (The "Special Sauce" is just ketchup, mayonnaise, and relish.) If your fish have sores or other health problems, then find the cause, fix it, and treat them with something besides a tap water conditioner if needed. Like every other tap water treatment API's instructions first tell you an amount of the product required to remove chlorine, and then in smaller print below say to use 2 to 3 times as much to also neutralize the more toxic chloramines that may be added during the purification of your water. I don't know why the companies that make these products won't be honest and say up front to use the higher amount, and then in small print say you can skimp and use less if you want to save money and risk the health of your fish. If you have confirmed with your local water authority that they do not use chloramines during their treatment or your water, then it only requires a single drop per gallon to remove chlorine. I did not bother to call my county water authority, since I had no way to confirm that the person who answered the phone would know chlorine, chloramine, nor chloroform for that matter. from their own colon or a hole in the ground. Even if you personally spoke to someone that could tell you for dead certain that chloramines are not being used, they are not going to text you if that changes in the future. Unless you are the person in charge of that step of water treatment for your area, the only way to know for certain if your water was safe for your fish with only a single drop per gallon, is if you use one drop, then test that water for any detectable ammonia that is the treated water. The chloramines contain a small amount of ammonia. Then you would know it was safe to add to your tank without causing them irritation and inflammation of their gill tissue. It is much safer to simply to add 3 drops per gallon. More doesn't hurt anything, but it's just wasted. To refill my tanks, I keep a pair of 5 gallon plastic bottles that were used for filtered / spring water. After I fill my tanks, I add the tap water treatment to the jug, refill it, and let it sit until I need it. This allows the conditioner time for its anti-heavy metal ingredients to work fully. It also lets the water come to room temperature, since 5 gallons of icy cold tap water in winter can cause the temp to drop in a 55 gallon tank. Perhaps more importantly, the water lines in many places are old and require frequent repairs or expansion. When repairs are made to water mains, they sometimes add extra chlorine disinfectant at the repair site to insure that any bacteria that might have gotten introduced to the main are killed and cannot grow and contaminate our drinking water. While I cannot normally detect a smell of chlorine in my tap water, I occasionally notice that it smells a bit more like a swimming pool than tap water. If more chlorine than normal is in the tap water, then more neutralizer would be needed. Most Chlorine will gas off on its own if the tap water is left uncovered for 24 hours, but Chloramine will not. When they disinfect a repair site, they are normally only using chlorine. By leaving the water I will add to my tank sitting for at least a day, then I am positive that it is always safe to add to my tank. I have had people ask me before if they can add the conditioner to the tank and then use a water hose to refill their tank. I don't normally recommend this because many of our fish are conditioned to come to the part of the tank where we are standing and adding water, because they think food will soon be added as well. If you add the conditioner to the tanks water rather than to the tap water first, then the tap water from a hose will take a short while to react with the treatment additive. Temporary short spikes of chlorine won't kill your fish, but cumulatively over time, it's not good for them either. Also unless you have a hose that is certified safe for drinking from, it can leach harmful chemicals into the water you're adding to the tank. If you are using a normal garden hose to refill your tank after water changes, at the minimum you should run water through it first for a few minutes to make sure that any that has been standing in the hose is washed out.
I**A
Will last a long time
This API Tap Water Conditioner works perfectly for my aquarium! It instantly makes tap water safe for my betta and keeps the water clear and healthy. A little goes a long way, so this bottle will last me a long time. Super easy to use and reliable ,definitely a must have for any fish owner!
Trustpilot
1 month ago
2 months ago