Brightwell Aquatics Kalk+2 – Premium Kalkwasser Powder Supplement with Calcium, Strontium, and Magnesium for Reef Aquariums, pH & Alkalinity Support, 450g

Does what kalk does in a reef tank. Has the extra elements as a bonus which is nice. High quality and clean. Keeps my reef going and my sps happy.

I had wanted to bump pH up from 7.9 to 8.3 for over a year because they say you get faster coral growth (BRS did a side-by-side experiment couple months ago out there on YT) but never had much luck breaking 8 with Kents or Seachem products - plus was leery of nuking the tank by accidentally overdosing with homebrewed kalkwasser.Started off using less than recommended Kalk in a big bucket of RODI and didn't touch it for a day to let everything settle. I then carefully did manual top offs from the bucket (stay away from the sediment) over the course of a week and was shocked when the pH came out at 8.4 that weekend (100g system and had planned on slowly raising over 2-3 weeks). That was about 2 months ago, and I've since been able to maintain at 8.3 just as hoped for. Finding that sweet spot in your parameters really does seem to boost SPS growth to the point that you can literally see montis getting bigger every day as opposed to weekly. Highly recommend - but for the love of your tank, use less than you think you need and take it slow.

Kinda pricy if you have a larger tank, but would be great for a smaller reef. Got this in a bind so I could get it next day and I will say it absolutely works and kept my tank stable . Potent stuff as well . Had to use slightly less then I was using standard kalk with the same results. Big plus on the added mag as well. I would say if you have a smaller or low demand larger tank this will absolutely work!

It would be cheaper to mix your own Kalk + mag/strontium, but this is a convenient option for lazy folks like us. No magic here - works just like Kalk.

Quality product, and fast shipping

My magnesium keeps running low. This product states that it has the same levels of Magnesium and Strontium as found in some kind of Rock they name. Don't care about the rock care about if it has the right rations for top off water. Obviously there a a ton of variables but wish they would just mix it so that it is correct for reef tanks and say that vs just grinding up a rock with the proper elements. Something like this product produces the three elements in the correct rations for Sea Water vs a rock that we grind up.

There are many brands of Kalk out there, but this is the only one I know of with added strontium, and magnesium. It helps keep my pH stable and dissolves easily . I use it in my top off water for my 180 gallon reef tank . The tank has been going well for almost 15 years ! Hard to argue with success.

The easiest way to keep ALK and CAL stable. My coral all thrived once I started using the Brigtwell Kalk. Be advised though any kalk will beat up your pumps. I had a few clog up and started dipping them in white vinegar overnight which helps remove the calcium buildup.A great solution I came up with that will help reduce the issue of sediment mucking up your ATO reservoir and tank is I bought a Chemical Guys dirt guard on Amazon. I placed it on the bottom of a 5 gal bucket and use that bucket to store my lime water. The sediment floats to the bottom of the bucket underneath the dirt guard and it helped a lot.