API Water Softening Pillow
Ideal for soft water aquariums. Ready-to-use pouch contains resins to remove calcium, magnesium and soluble heavy metal ions, including copper and iron. May be recharged for multiple uses.
Benefits
- Clears aquarium water
- Will not raise phosphate levels
- Fits most filters
- For use in freshwater, saltwater and reef aquariums
Directions
- Rinse pouch under tap water.
- Place pouch in path of water flow in the aquarium filter.
- Activity of the pillow lasts 48 hours. After 48 hours, recharging is necessary.
- To recharge: dissolve 3 tbsp. of API AQUARIUM SALT in 7 oz. of tap water.
- Rinse pouch in tap water, then soak in salt solution for 2 hours. Place back in filter.
| Specification | Detail |
|---|---|
| Material | Resin-based pouch |
| Usage | Freshwater, saltwater, reef aquariums |
| Recharge Cycle | Every 48 hours |
| Removes | Calcium, magnesium, copper, iron |
FAQ
How often should I recharge the water softening pillow?
The pillow should be recharged every 48 hours after its activity period ends.
Does the pillow affect phosphate levels in the aquarium?
No, the pillow will not raise phosphate levels.
Can I use this pillow in a reef aquarium?
Yes, it is suitable for use in freshwater, saltwater, and reef aquariums.

Karen Oliver –
The pillow works well in my 55-gallon saltwater tank. It keeps water soft without increasing phosphates. I recharged it after two days as instructed and it performed smoothly. Easy to install and fits perfectly in my filter.
Alan Chapman –
I’ve used this for three weeks in my freshwater tank. It helped reduce calcium buildup and the water clarity improved noticeably. Recharging took about two hours, which is manageable.
Stephanie Springer –
Great product for maintaining stable water chemistry. No issues with heavy metals or phosphate levels. Works well with my reef setup and fits in the filter without any adjustments.
Robert Glover –
It works, but I noticed the water flow is slightly reduced when the pillow is in place. Still effective for softening, and the recharging process is straightforward.