ESV Aquatics B-Ionic Calcium Buffer System, 2-part Calcium and Alkalinity Maintenance Kit for Salt Water Coral Reef Aquarium, 32 Ounce

This is my go to brand for quality Alkalinity and Calcium. The ingredients and quality consistency has been very good. The volume of product for the price is a great value compared to fish stores. This brand of 2 part has done wonders for my 5 year old reef tank! I will be back for more!

My water parameters were off and things were not thriving .. now my corals are growing and happy .

Very good product and easy to use. Just be warned that when ordering ,if you order the 32oz size, you will receive a bottle of each part that is 16oz. Not 2 bottles of 32oz. Makes sense but it caught me off guard. Unfortunate that this isn’t mentioned under the product description.

Love this stuff. I put it in my 90 gallon reef tank every morning.Ok, I don't really, but I do it when I remember. The corals seem to love it. I asked them and they didn't respond, but that's because corals can't talk. If they COULD respond they'd tell me that they love this stuff, along with some critiques about my tank maintenance practices and personal hygiene.My fish seem indifferent and downright apathetic to it, but fish are stupid. Have you ever seen a fish with a college degree? No, not a dolphin - those are porpoises and I said fish. That's what I thought. They wouldn't know a good 2-part Calcium buffer product if it smacked them in the face.I don't know if I need this stuff really, but I like it. My tank is purpler and that is pretty. The way it makes a 10 second cloudy burst of chaos when part one is administered is fun, too, and I get to say things like "Oh no! There's been a terrible explosion and life as you know it is going to end! Quickly, find solace amidst the coral reef!" Stupid clownfish. They aren't even funny.

The product is very convenient to use. The only downside is the dosage recommendations could be improved.

I have used this product for years with great success in my Saltwater Reef Aquarium

The measurement cup these came with was broken upon arrival, (it was flimsy) but this two part does the job. I let the alk get too low in my aquarium while I was minimizing water changes to help it cycle, and a huge really old piece of SPS my friend gave me died. In a panic, I bought this two part, and changed 1/5 of the water. It saved the frags of sps I had left, and my alk went up to recommended levels. my only gripe is the price. for big tanks, 100+ gal, definitely get the gallon jugs. It's easy to use, but you will need your own measuring device.

Ph stabilizer plus trace elements replenishment.