Corosex© - Fast-acting Ph Neutralization Media Used for Large pH Corrections
Corosex© is coposed of magnesium oxide and is a fast-acting media used to boost pH particularly in high flow rate applications or where large pH corrections are required such as then the raw water pH level is less than 6.0. The media is slowly consummed and will need to be replenished periodically. Accordingly, it is ofte used with "in/out" style valves with a fill port of with "dome hole" style media tanks that have a port for this purpose.
Corosex© can neutralize five times more acidity than and equal amount of Calcite (by weight). This results in less media consumption. However, unlike Calcite which is self-limiting, Corosex© may overcorrect. It can raise the pH beyond neutral and potentially above the target level. Accordingly, it is typically blended with calcite at a ratio that achieves the desired pH correction without over-correcting.
As Corosex© neutralizes acidic pH, it will increase the hardness of the water and a softener may become necessary after the neutralizing filter. Where the feed water is greater than about 5 grains per gallon (85 ppm or mg/l) of hardness, pH correction with Corosex© can cause hardness minerals to precipitate out of solution, resulting in cementing or solidification of the Corosex© mineral bed. To prevent this effect, upflow service is generally recommended with hardness exceeding 5 grains per gallon (85 ppm or mg/l). If downflow configuration is used, frequent backwashing should be undertaken to prevent hardening of the media bed. This is generally effective where the Corosex© to calcite blend does not exceed 50/50.
Corosex© Advantages:
- Fast acting
- Capable of large pH corrections - effective over a wide pH range of 4.5 to 6.0
- Certified to NSF/ANSI Standard 60
Corosex© Disdvantages:
- May over-correct
- Increases water hardness
A gravel support bed is recommended.
We strongly recommended using a blend of Corosex© and Calcite rather than 100% Corosex© media. Further, we recommend starting with a relatively low ratio of Corosex© (about 10%) and continue increasing the ratio until the targeted pH correction is achieved without over-correcting.
Operating Conditions / Requirements:
| Service Flow Rate: | 5 to 6 GPM/ft2 | |
|---|---|---|
| Flow Direction: | Upflow or Downflow | |
| Backwash Flow Rate (Downflow Service): | 10-12 GPM/ft2 | |
| Typical Freeboard: | 50% | |
| Minimum Bed Depth: | 24 Inches | |
| Recommended Bed Depth: | 24-30 Inches | |
| Recommended pH: | 4.5 to 6.0 | |
| Weight: | 75 lbs per ft3 |
| Service Flow Rate: | 5 to 6 GPM/ft2 | |
|---|---|---|
| Flow Direction: | Upflow or Downflow | |
| Backwash Flow Rate (Downflow Service): | 10-12 GPM/ft2 | |
| Typical Freeboard: | 50% | |
| Minimum Bed Depth: | 24 Inches | |
| Recommended Bed Depth: | 24-30 Inches | |
| Recommended pH: | 4.5 to 6.0 | |
| Weight: | 75 lbs per ft3 |
Corosex© is a federally registered trademark of Clack Corporation.
FloMag© PWT 6x16 is a trademark of Martin Marietta Magnesia Specialties, LLC
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