Pond Boss Magazine
https://www.pondboss.com/images/userfiles/image/20130301193901_6_150by50orangewhyshouldsubscribejpeg.jpg
Advertisment
Newest Members
Shotgun01, Dan H, Stipker, LunkerHunt23, Jeanjules
18,451 Registered Users
Forum Statistics
Forums36
Topics40,902
Posts557,113
Members18,452
Most Online3,612
Jan 10th, 2023
Top Posters
esshup 28,417
ewest 21,475
Cecil Baird1 20,043
Bill Cody 15,112
Who's Online Now
9 members (anthropic, Boondoggle, Fishingadventure, phinfan, jpsdad, Brett B, catscratch, jbird5986, Freg), 644 guests, and 171 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
#136499 10/20/08 09:18 AM
Joined: Aug 2008
Posts: 15
B
Lunker
OP Offline
Lunker
B
Joined: Aug 2008
Posts: 15
What does hardness mean to my pond? My pond measured 222 ppm. Which means I have hard water. All this tells me is that the concentration of carbonates and bicorbonates originated from bedrock consisting of limestone and/or dolomite. But what does this mean for the overall health and water quality of my pond? Should I do anything now?

Joined: Mar 2005
Posts: 21,475
Likes: 264
E
Moderator
Hall of Fame 2014
Lunker
Offline
Moderator
Hall of Fame 2014
Lunker
E
Joined: Mar 2005
Posts: 21,475
Likes: 264
From http://srac.tamu.edu/index.cfm?catid=25

Its about the Ca and Mg salts which may not necessarly be there if the alkalinity is from sodium bicarbonate.



Interactions of pH, Carbon Dioxide,

Alkalinity and Hardness in Fish Ponds

Hardness

Water hardness is important to

fish culture and is a commonly reported

aspect of water quality. It

is a measure of the quantity of divalent

ions (for this discussion,

salts with two positive charges)

such as calcium, magnesium

and/or iron in water. Hardness

can be a mixture of divalent salts;

however, calcium and magnesium

are the most common sources of

water hardness.

Hardness is traditionally measured

by chemical titration. The

hardness of a water sample is reported

in milligrams per liter as

calcium carbonate (mg/L CaCO3).

Calcium carbonate hardness is a

general term that indicates the

total quantity of divalent salts present

and does not specifically identify

whether calcium, magnesium

and/or some other divalent salt is

causing water hardness.
Hardness is commonly confused

with alkalinity (the total concentration

of base). The confusion relates

to the term used to report

both measures, mg/L CaCO3. If

limestone is responsible for both

hardness and alkalinity, the concentrations

will be similar if not

identical. However, where sodium

bicarbonate (NaHCO3) is responsible

for alkalinity it is possible

to have low hardness and high

alkalinity. Acidic, ground or well

water can have low or high hardness

and has little or no alkalinity.

Calcium and magnesium are essential

in the biological processes

of fish (bone and scale formation,

blood clotting and other metabolic

reactions). Fish can absorb calcium

and magnesium directly

from the water or from food.

However, calcium is the most important

environmental, divalent

salt in fish culture water.
The presence

of free (ionic), calcium in culture

water helps reduce the loss of

other salts (e.g., sodium and potassium)

from fish body fluids (i.e.,

blood). Sodium and potassium

are the most important salts in fish

blood and are critical for normal

heart, nerve and muscle function.

Research has shown that environmental

calcium is also required to

re-absorb these lost salts. In low

calcium water, fish can lose (leak)

substantial quantities of sodium

and potassium into the water.

Body energy is used to re-absorb

the lost salts. For some species

(e.g., red drum and striped bass),

relatively high concentrations of

calcium hardness are required for

survival.

A recommended range for free calcium

in culture waters is 25 to 100

mg/L (63 to 250 mg/L CaCO3

hardness). Channel catfish can tolerate

low calcium concentrations

A low CaCO3 hardness value is a

reliable indication that the calcium

concentration is low. However,

high hardness does not necessarily

reflect a high calcium concentration.

But, since limestone is common

in the soil and bedrock of the

southern United States, it would

be reasonably safe to assume that

high hardness measurements reflect

high calcium levels.

A CaCO3 hardness value of 100

mg/L represents a free calcium

concentration of 40 mg/L (divide

CaCO3 value by 2.5) if hardness is

caused by the presence of calcium

only. Similarly, a CaCO3 value of

100 mg/L represents a free magnesium

value of 24 mg/L (divide

CaCO3 value by 4.12) if hardness

is caused by magnesium only.

These factors (2.5 and 4.12) are related

to the molecular weight of

CaCO3 and the difference in

weights between calcium and magnesium

atoms. Where hardness is

caused by limestone, the CaCO3

value usually reflects a mixture of

free calcium and magnesium with

calcium being the predominant divalent

salt.

Ideally, an aquaculture pond

should have a pH between 6.5 and

9 as well as moderate to high total

alkalinity (75 to 200, but not less

than 20 mg/L) and a calcium hardness

of 100 to 250 mg/L CaCO3.

Many of the principles of chemistry

are abstract (e.g., carbonate-bicarbonate

buffering) and difficult

to grasp. However, a fundamental

understanding of the concepts and

chemistry underlying the interactions

of pH, CO2, alkalinity and

hardness is necessary for effective

and profitable pond management.

There is no way to avoid it; water

quality is water chemistry.
















Joined: Feb 2006
Posts: 210
M
Lunker
Offline
Lunker
M
Joined: Feb 2006
Posts: 210
What Erik said.
Keep in mind that water analysis are often (usually) reported as CaCO3 equivalents. That is, calcium may be reported as CaCO3 even if the calcium is not in the form of that salt. Calcium can be associated with sulfate for example, but be reported as the CaCO3 equivalent. To fully understand the water, you need to have a complete water analysis done. This will have all anions and cations reported and will give likely associated compounds. You need to know if the sample is reported as ion or as CaCO3 equivalent to balance the equations if this is not done.
Mike


Mike
Joined: Jun 2005
Posts: 2,365
B
Lunker
Offline
Lunker
B
Joined: Jun 2005
Posts: 2,365
 Originally Posted By: Ben Venturini
What does hardness mean to my pond? My pond measured 222 ppm. Which means I have hard water.


Since 222 is in the high normal range, it means your pond water is (barring other problems)healthy for the fish, and probably nice and clear.

Joined: May 2002
Posts: 3,973
G
Ambassador
Field Correspondent
Lunker
Offline
Ambassador
Field Correspondent
Lunker
G
Joined: May 2002
Posts: 3,973
Bobad agree it probably means healthy. Not necccesarily agree with the clear part that depends on nutrients i.e. Phosphorus.


Greg Grimes
www.lakework.com

Link Copied to Clipboard
Today's Birthdays
cro, HC1968
Recent Posts
Relative weight charts in Excel ? Calculations?
by jpsdad - 03/28/24 09:45 PM
pond experience needed
by jbird5986 - 03/28/24 09:39 PM
Alum vs Bentonite/Lathanum for Phosphorus Removal?
by FishinRod - 03/28/24 08:28 PM
New pond middle TN: establishing food chain?
by Bill Cody - 03/28/24 07:57 PM
Happy Birthday Bob Lusk!!
by FireIsHot - 03/28/24 07:33 PM
Working on a .5acre disaster, I mean pond.
by PRCS - 03/28/24 06:39 PM
Fungus infection on fish
by nvcdl - 03/28/24 06:07 PM
Can anyone ID these minnows?
by Dylanfrely - 03/28/24 05:43 PM
1 year after stocking question
by esshup - 03/28/24 04:48 PM
Yellow Perch Spawn 2024
by H20fwler - 03/28/24 04:29 PM
New 2 acre pond stocking plan
by LANGSTER - 03/28/24 03:49 PM
Paper-shell crayfish and Japanese snails
by esshup - 03/28/24 10:39 AM
Newly Uploaded Images
Eagles Over The Pond Yesterday
Eagles Over The Pond Yesterday
by Tbar, December 10
Deer at Theo's 2023
Deer at Theo's 2023
by Theo Gallus, November 13
Minnow identification
Minnow identification
by Mike Troyer, October 6
Sharing the Food
Sharing the Food
by FishinRod, September 9
Nice BGxRES
Nice BGxRES
by Theo Gallus, July 28
Snake Identification
Snake Identification
by Rangersedge, July 12

� 2014 POND BOSS INC. all rights reserved USA and Worldwide

Powered by UBB.threads™ PHP Forum Software 7.7.5