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💧 Transform your aquarium water, transform your vibe!
The API WATER SOFTENER PILLOW is a pre-dosed filtration pouch designed to reduce water hardness by lowering calcium and magnesium levels in freshwater aquariums. It fits most canister filters, removes heavy metals and mineral deposits, and can be recharged for reuse, ensuring crystal-clear water and a healthier aquatic environment. Trusted by aquarium enthusiasts for over 50 years, it’s a simple yet powerful solution to maintain optimal water quality and protect your fish.



















| ASIN | B002DW0GQQ |
| Allergen Information | Apple Free |
| Best Sellers Rank | #13,543 in Pet Supplies ( See Top 100 in Pet Supplies ) #95 in Aquarium Filter Accessories |
| Brand | API |
| Brand Name | API |
| Customer Reviews | 4.2 out of 5 stars 3,426 Reviews |
| Global Trade Identification Number | 00317163001493 |
| Included Components | 16 Oz Bottle Of Algaway 5.4 Algaecide |
| Item Form | Granules |
| Item Type Name | Aquarium Filtration Media |
| Item Weight | 23 Grams |
| Manufacturer | Mars Fishcare |
| Manufacturer Part Number | 49A |
| Model Number | 49A |
| Number of Packs | 1 |
| Pet Type | Fish |
| Target Species | Fish |
| UPC | 317163001493 |
| Unit Count | 1 Count |
J**A
It does the job and adjusts the chemistry perfectly.
This corrected my chemistry in my betta tank in two days. Fast results. Very pleased with this product. A must buy if u need to Correct chemistry in your tank. I have a 10 gallon betta tank and it worked wonders.
N**E
It does soften the water.
It leaked everywhere. I took my tank apart. Collected the little chunks. Put it all in a sock and put it in the filter again. It definitely softened the water. But then I found out the fish store used local tap water which is hard so the fish I bought needed hard water and the snail's shell suffered from the soft water.
M**E
Worked for 5 gallon tank
I have well water that is very hard. I put this pillow in the filter and just a little over 12 hours there was a dramatic improvement. I'll leave it in just a little longer next time. I didn't give 5 stars for ease of use for a few reasons. It's too big for my extra small filter pump and I couldn't find a smaller one so I did expect that anyways. I removed the carbon filter temporarily, then I just stuffed the pillow into the filter, but not so much as to cause the flow to be blocked. It will stick out at the top because you can't stuff the whole pillow in and left the cover off. When I was done with the pillow I put my carbon filter back in. The only other thing is that the pillow contents are not distributed well in the pillow cover. It wants to collect on one side. Despite all this it is sufficient for my 5.5 gallon set up.
C**E
Use these
This stuff actually worked. I’ve been plagued by hard water ever since moving to my current home twelve years ago. My aquarium equipment has always gathered white buildup no matter how many softeners I tried. UNTIL this one! Absolutely zero buildup has stuck since I added one of these packs to my tank! I am so thrilled. Everyone in the tank seems happy and healthy and I’ve been using these for about a year now. Water clarity is crystal as always.
A**R
Returned
Not able to use, bag too big for my filter
N**N
It works
It works. Depending on the size of your aquarium, and the hardness of your water, it might not get all the way in one use. That's fine, it's reusable. MAKE SURE TO READ THE STORAGE/ RECHARGE INSTRUCTIONS. I keep the instructions rubber-banded to the bottle I store it in.
A**I
Excellent purchase!
Works as described. Fits into my TopFin hob perfectly. Definitely improves water clarity. Great value for the money. Nitrite levels are improving and helps with the smell.
R**D
Did nothing but raise the nitrate levels to off the charts!
Was in 2, 20 gallon tanks and a 55 for a couple days and did not lower the hardness at all, but actually increased the nitrates exponentially and now I can’t get them down. I guess it works for some people, but thankfully there are no fish in the tanks yet.
T**A
Pas cher et efficace!
J'ai utilisé se produit dans mon filtre fluval 107 pour mon aquarium 10 gallons. Mon GH était trop élevé! Il était à 12 degrés GH. Mon aquarium est communautaire. Mes 10 poissons sont des microrasboras galaxy, j'ai 10 crevettes néocardina Davidi (blue velvet) et 1 escargot Neritina. J'ai mis le sac dans mon filtre le soir avant de me coucher. Le lendemain, j'ai pris le test de GH et il a baissé a 6 GH! Il a permis de baissé de 6 degrés durant la nuit après environ 10h d'utilisation. Wow! Je suis vraiment impressionné du résultat! Je recommande fortement si vous voulez réduire rapidement le gh a cause de l'utilisation de l'eau du robinet.
C**N
Funciona muy bien
Bajo la dureza de la noche a la mañana literal. Pero únicamente es un saco
A**N
Didn't worked for me
It seems like it didn't work for me....... didnt reduce my water hardness.... in spite use as directed
S**M
worked great in London's hard water
My water hardness was off the chart, followed instriction, worked great. It also helped to balance pH and KH. Althought initial charge of this pillow lats 48 hours (recharge needed with API salt, purchased seperatly), but my desired level was achived within 2 hours, therefore PLEASE CHECK EVERY HOUR, otherwise water will become too soft. 👇🏼👇🏼👇🏼EDIT: Few points in relation to the bag/size: - The bag is a bit big for someone like me, so, i purchased them small mesh bags with zip (very fine mesh made from plastic meterial and MUST have zip, not string lock), search for: [ZEYIYER 10PCS Aquarium Mesh Bag]. - - If you are unable to fit the bag in your filter ( path of water flow in the aquarium filter), then you can just drop the bag in the aquarium. But this way will be slow to achive the desired level of GH, but it will work. As i said above, you must check hourly where possible, and not to leave it overnight as water may become very soft. (Ideal is 100-200ppm in comunity tank) - You can buy a seperate cheapest filter (may AliExp/Temu etc) and just use this bag, or your own bag inside the filter and drop the filter anywhere in the tank as this is work faster. Recharge / salt: As directed in the packet, you will need to use salt to recharge, and it does last long application after application. If you are worried about salt, worry not, as small amount of salt in freshwater tank will not harm fish/plant. But if you are really worried, after recharge, you can rinse the bag in tap water for 1 to 2 minutes. General Hardness: What i learned that the ideal level of GH is 100-200ppm in comunity tank. But i live in London, and I realised almost ALL aquarium shop the GH in their tank is very high, so most fish are bread/born in hard water. So check the water GH when you buy fish (you can test the water in the bag the fish came in). Most i tested was well above 400-600+ppm. So, it is important, in my openion, not to lower your ppm directly to, for example, 200ppm, but slowly day-by-day. Therefore, use the Softener Pillow bag, take it out, let the fish settle, and try again after a day or two to get the water level to 100-200ppm which will keep fish/plants healthy.
Z**D
Useless
it's useless, in fact my TDS Increased !!!
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