Dosing Calcium Sulfate - The Planted Tank Forum
 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 11-25-2014, 06:03 PM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Jan 2014
Location: Scotland, UK
Posts: 135
Dosing Calcium Sulfate

What would be the effect of adding loads of Calcium Sulfate to an aquarium?

It's not a practical question -- my tank is fine -- I was just wondering what adding loads of Sulfuric acid was doing to an old tank of mine (Sulfuric acid being the sole ingredient of old my "pH down"solution).

The main carbonate/bicarbonate is Calcium so that would mean...Calcium Sulfate.

acid + metal carbonate → a salt + water + carbon dioxide

H2SO4 + CaCO3 → CaSO4 + H2O + CO2

In a hypothetical scenario, if one were to have a "seriously high" pH and a "seriously high" KH, and one were to dose "serious amounts" of Sulfuric acid, creating "serious amounts" of Calcium Sulfate, what would this mean to the plants, fish, and my personal safety? Seriously!
141130 is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 11-25-2014, 06:42 PM
Planted Tank Guru
 
PTrader: (3/100%)
Join Date: Aug 2014
Location: Maryland, USA
Posts: 2,339
Well, adding calcium sulfate as a dose would raise the general hardness of the water (GH), and sulfate content of the water.

However, you're not talking about adding calcium sulfate.. You're talking about adding sulfuric acid to water that already has a lot of calcium in it. In this interaction the hardness stays the same.

All you're doing with sulfuric acid additions is:
1) driving down pH
2) driving down KH (and producing CO2 in the short term).
3) increasing sulfate

The interaction of the sulfate with calcium is irrelevant, as in solution they're both effectively free ions and the calcium was already there,

Generally speaking, having incredibly high sulfate content isn't a very good thing, but within any kind of sane limits the extra sulfur is just plant fertilizer.

The reduction in KH (and buffers in general) would be something that I would be keeping an eye on, too low there and it can destabilize pH.
mattinmd is offline  
post #3 of 5 (permalink) Old 11-25-2014, 07:34 PM
Planted Tank Enthusiast
 
JoeRoun's Avatar
 
PTrader: (0/0%)
Join Date: Dec 2009
Location: Surprise, AZ
Posts: 634
Smile What Do You Want to Accomplish?

Hi David,

In plain language, what are you trying to accomplish?

If you know the carbonate hardness (KH), pH and temperature tell us. Then say what parameters you would like.

If this is simply hypothetical or academic that is okay, but if this is real world, lets deal with the “practical how-to’s,” then worry about the science later.
-
Respectfully,
Joe
FBTB

If your Guru tells you otherwise and you are true believer that is okay I will not argue the point.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


I pretty much limit what I say to things that anyone can easily verify from recognized references or by direct observation. If it is my opinion I say so.

JoeRoun is offline  
 
post #4 of 5 (permalink) Old 11-25-2014, 08:41 PM Thread Starter
Algae Grower
 
PTrader: (0/0%)
Join Date: Jan 2014
Location: Scotland, UK
Posts: 135
Quote:
Originally Posted by mattinmd View Post
Generally speaking, having incredibly high sulfate content isn't a very good thing, but within any kind of sane limits the extra sulfur is just plant fertilizer.
Great. Thanks. So given that the most common carbonates the Sulfuric acid would react with are Calcium and Magnesium, I would mostly get Calcium Sulfate and Magnesium Sulfate -- and you say that these are basically fertalisers? Plaster of Paris and epsom salts, right?
141130 is offline  
post #5 of 5 (permalink) Old 11-26-2014, 03:18 AM
Moderator
 
Darkblade48's Avatar
 
PTrader: (3/100%)
Join Date: Jan 2008
Location: Toronto
Posts: 11,711
Quote:
Originally Posted by david765 View Post
Great. Thanks. So given that the most common carbonates the Sulfuric acid would react with are Calcium and Magnesium, I would mostly get Calcium Sulfate and Magnesium Sulfate -- and you say that these are basically fertalisers? Plaster of Paris and epsom salts, right?
Unless you are adding large amounts of sulfuric acid to the aquarium (wherein you will have other detrimental effects to worry about), the dissolution of carbonate salts will be much too slow.

Strictly speaking, yes, the carbonates would slowly react to form free ions, but you would not get magnesium sulfate (easily soluble). Similarly calcium sulfate, while often considered "insoluble", would probably not be observed, given the relatively large volume of water in an aquarium.

Anthony


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
and
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Eheim Pimp #362 - Eheim 2213 x2, Eheim 2028, Eheim 2217, Eheim surface skimmer and Eheim autofeeder.
Victor Pimp #33 - HPT272-125-350-4M
Darkblade48 is offline  
Reply

Tags
None

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome