I use Kent's Liquid Reactor & am very happy with it.

I can see my range of options is expanding

Here is the cheapest, and what I use for the occasional Ca+ boost...

Go to your local Pool & Spa dealer and ask for Calcium Chloride... for around $15 you will get as much as you need for years... and it is the identical chemical and physical composition as Kent Turbo Calcium or the old ESV, (now SeaChem???), Calcium Chloride. Dose the same as you would the Kent product... and before people flame me... I have done my research on this... and pretty much ALL Calcium Chloride is composed of 77 - 80% Calcium Chloride & the rest moisture by weight... INCLUDING Kent.

Bulk CaCl from Littlesilvermax. Exactly the same as the branded stuff.

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Good to know Reeferaddict.

If you use a Calcium Chloride supplement long term, the ratio between chloride and sulfate will become skewed (sulfate coming from your salt mix). It's wise to mix up some Magnesium Sulfate to offset the imbalance..Epsom salt is recommended.

The Salifert product includes sulfate ions, so there might be an advantage to using it ??

Good point.

I use a sulphur denitrator in my system so this isn't really a concern. Water changes help all of this though... :mrgreen: I also only use it occasionally... once you get levels where you want them always best to switch to a balanced additive system... (Ca+ Reactor, Kalk, 2 part, etc etc etc...) Also as someone else stated, Magnesium levels need to be right or you may never get your Calcium levels up...

I don't have any experience using their calcium products but Salifert is a reputable company and the owner Habib sp?? is very knowledgeable in Reef chemistry..I would trust that label.

I am no expert, but I do sell the stuff, and this is what I know.

Seachems stuff is good, it has some magnesium added in.

The stuff I sell is about 1/3 the price but has no magnesium added in, but I also sell magnesium too. It dissolves very quickly. The Seachem stuff dissolves faster because it is grinded into smaller chunks, almost powdery, you could do the same with the stuff I sell, but I have seen no need to do that.