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Ships within 48 hours · Estimated delivery Jul 15 - Jul 20
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Description
Sera Marin Component 1 Ca 250ml[Volume - 250ml]Contains essential calcium necessary for the development of coral skeletons and other invertebrates. It is recommended to use this alongside Sera marin COMPONENT 2 and Sera marin COMPONENT 1 Ca calcium formulated specifically for seawater. The complete series of Sera marin COMPONENT 1 7 is designed for advanced marine aquaristics, providing corals and various lower animals with seven beneficial ingredients that work harmoniously together. Sera marin
Contains essential calcium necessary for the development of coral skeletons and other invertebrates. It is recommended to use this alongside Sera marin COMPONENT 2 and Sera marin COMPONENT 1 Ca - calcium - formulated specifically for seawater. The complete series of Sera marin COMPONENT 1 - 7 is designed for advanced marine aquaristics, providing corals and various lower animals with seven beneficial ingredients that work harmoniously together. Sera marin COMPONENT 1 Ca supplies vital calcium for the formation of skeletons in corals and other lower animals. The optimal calcium concentration in water should range from 400-450 mg per liter. You can easily check the calcium levels using the sera Ca-test. When Sera marin COMPONENT 1 and 2 are combined, they help achieve the ideal pH level found in seawater and maintain the natural balance in your coral aquarium. Dosage: Use the cap as a measuring tool. Always add one capful of Sera marin COMPONENT 1 and 2 for every 100 liters of seawater, allowing a 2 to 3-minute interval between additions. It is important not to raise the calcium level by more than 20 mg/l in a single day.Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 985 reviews
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Product Reviews
★★★★★ 5
Love these!
Size: Standard (20" X 26"), Color: 02 - White - Zipper, Number of Items: 2
I like these better than the Blissy mulberry silk pillowcase. They feel smoother and softer and make my hair less frizzy. I've been buying these for years and they hold up great! I just switched to the zipper version instead of the envelope style, and I really like the more modern aesthetic of the hidden zipper. They are nice!
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Reviewed in the United States on May 3, 2026
★★★★★ 4
Fitment
Size: Queen (20" X 30"), Color: 04 - Black - Zipper, Number of Items: 2
Nice pillow cases, good construction and materials. But just a little short length wise. Very tight fit
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Reviewed in the United States on January 21, 2026
★★★★★ 5
Great pillowcase!
Size: Queen (20" X 30"), Color: 02 - White - Zipper, Number of Items: 2, Size: Queen (20" X 30"), Color: 02 - White - Zipper, Number of Items: 2
I bought these because they were recommended by my hairdresser for hair breakage. I love the zipper because the pillow can’t slip out. I will sy these do feel nice against the skin as well.
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Reviewed in the United States on April 9, 2026
★★★★★ 5
Silky for your hair no frizz
Size: Queen (20" X 30"), Color: 09 - Blue - Zipper, Number of Items: 2
Great quality silky pillowcases for my curly hair , doesnt make your hair frizzy like cotton pillowcases , good communication with seller if needed, bought from this seller numerous times , lots of colors to choose from too, quick shipping .
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Reviewed in the United States on May 25, 2026
★★★★★ 5
Feels heavenly
Size: King (20" X 36"), Color: 14 - Lavender - Zipper, Number of Items: 2
Literally just got it in the mail and fell in love. It's so soft and wasn't being harsh with my beard hair. Hopefully no more split ends! (Good hair protection!)
There was no odor to speak of and it fit my pillow perfectly, we got king size, (AKA good compatibility)
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Reviewed in the United States on April 10, 2026