Reef Central Online Community
Neptune Systems

Home Forum Here you can view your subscribed threads, work with private messages and edit your profile and preferences View New Posts View Today's Posts

Find other members Frequently Asked Questions Search Reefkeeping ...an online magazine for marine aquarists Support our sponsors and mention Reef Central

Go Back   Reef Central Online Community > General Interest Forums > The Reef Chemistry Forum
Register Blogs FAQ Calendar Mark Forums Read

Notices

Reply
Thread Tools
Old 12/08/2017, 12:49 PM   #1
benstatic
Registered Member
 
Join Date: Nov 2017
Posts: 8
Anybody use CaSO4 as an additive?

I only ask as I have some lying around for my freshwater plants.
It seems almost all of the additives I have seen on the market are Calcium Chloride...

I am not a chemist, would not know if the Ca would unbind with Sulfate and pair instead with Carbonate...

Seeing if anybody has experimented with this, or terrible idea.


benstatic is offline   Reply With Quote
Old 12/08/2017, 01:57 PM   #2
nereefpat
Registered Member
 
nereefpat's Avatar
 
Join Date: Apr 2016
Location: Central Nebraska
Posts: 1,763
Yes, people that supplement Ca will usually use CaCl, unless using kalk (to raise both alk and Ca).

The CaSO4 would disassociate into Ca and SO4, just as CaCl would become Ca+ and Cl-ions.

Two part additives like CaCl will add Chloride over time, which isn't a big deal since there is a lot of Chloride in natural seawater. There isn't as much Sulfate, so using CaSO4 over time could be a problem.

I would get some CaCl. It's pretty cheap.


__________________
Pat

Current Tank Info: 125 in-wall , 40b sump. 6 bulb T5. ASM G2 skimmer. LPS and leathers
nereefpat is online now   Reply With Quote
Old 12/08/2017, 02:19 PM   #3
Tripod1404
Registered Member
 
Join Date: Mar 2016
Posts: 893
Like nereefpat said, CaCl2 is a better option. There is ~19000 ppm of Cl ion in natural sea water. So if you wanted to increase Ca by say, 50ppm, dosing required amount of CaCl2 will raise Cl by 100 ppm. An increase of Cl from ~19000 to 19100 ppm is not a big deal.

A 50 ppm raise in Sulfate from dosing corresponding CaSO4 can be a problem. Sulfate have the capacity to fuel growth of sulfer reducing bacteria which produce toxic hydrogen sulfide.


Tripod1404 is online now   Reply With Quote
Old 12/08/2017, 04:35 PM   #4
bertoni
RC Mod
 
Join Date: Mar 2002
Location: Mountain View, CA, USA
Posts: 85,860
I agree that calcium chloride is a better choice. The sulfate would be fine if only a small amount is used. There is a fair amount of sulfate in seawater, too:

http://reefkeeping.com/issues/2005-11/rhf/index.php#5


__________________
Jonathan Bertoni
bertoni is offline   Reply With Quote
Old 12/08/2017, 05:30 PM   #5
Dan_P
Registered Member
 
Join Date: Aug 2014
Posts: 1,151
Calcium sulfate is not very soluble, about 200 mg will dissolve in 100 ml of water. Of that 200 mg about 1/3 is calcium or about 60 mg. If you wanted to increase the calcium level in 1 liter of salt water using a saturated freshwater solution of calcium sulfate, it would cause a large salinity change.


Dan_P is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -6. The time now is 02:21 PM.


TapaTalk Enabled

Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2017 Axivo Inc.
Use of this web site is subject to the terms and conditions described in the user agreement.
Reef CentralTM Reef Central, LLC. Copyright 1999-2014