Fleck 7000 Neutralizer Installation & Startup Guide
Page 12
www.cleanwaterstore.com
Rev 120215
When to Use Calcite Blends
If the water pH is less than 6.0, Calcite alone may not be enough to bring the pH up to the desired range of
7.0 to 7.8. In this case, a blend of Calcite and Corosex should be used. Calcite is a calcium media consisting of
calcium carbonate and will raise the pH slowly. Calcite will not raise the pH much over 7.2. Corosex is a
natural mineral media consisting of magnesium oxide. It reacts much faster and raises the pH much higher
than Calcite alone.
Corosex is almost never used alone as it will raise the pH too high and in some cases will over-correct and
create a highly basic (high pH) condition. It can also cement together like concrete in the neutralizer tank if
you add too much and there is not sufficient backwash.
For most residential well applications, a 90% Calcite and 10% Corosex is best. However, in some cases an
80%/20% mix or even a 70%/30% is used. It is always better to start with a 90%/10% mix at first as this
solves the majority of low pH problems in the range of 4.5 to 5.9.
For a pH of 6.0 to 6.9 use Calcite alone.
For a pH of 5.0 to 6.0 use a blend of Calcite and Corosex usually 90% Calcite and 10% Corosex, or more
Corosex as needed if the pH is less than 5.0.
How to Mix and Use Calcite Blends
The Calcite and Corosex media is sold and shipped in separate boxes. It does not have to be completely
blended together to use as it will mix during the backwash and rinse cycles. Still, when you are adding the
Calcite and Corosex it is better to blend it lightly in a 5 gallon bucket and then add it. You can also add some
Calcite and then add some Corosex as you are filling the tank. Do not fill tank more than about 2/3rds full.
Note the following:
Calcite is shipped in 50 lb boxes and one box of Calcite is equal to 0.55 cu ft.
Corosex is shipped in 10 lb boxes and 1 box is equal to 0.13 cu ft.
50 lbs of Calcite = 0.55 cubic foot of media
50 lbs of Corosex = 0.66 cubic foot of media
Neutralizers 1.0 Cubic Foot:
use 90lbs Calcite and 10 lbs Corosex
Your new 1.0 CF neutralizer includes:
Calcite 100 lbs (2 50-lb boxes) 1.1 cu ft
Corosex 10 lbs (1 10 lb boxes) .13 cu ft
Neutralizers 1.5 Cubic Foot:
use 150 lbs Calcite and 10lbs Corosex
Your new 1.5 Cubic Foot Neutralizer Blend filter includes:
Calcite 150 lbs (3 50-lb boxes) 1.65 cu ft
Corosex 10 lbs (1 10 lb boxes) .13 cu ft
Neutralizers 2.0 Cubic Foot:
use 150 lbs Calcite and 20lbs Corosex
