Not saying you should drink Excel, but it is alot safer to use and contact. For someone new to the hobby, keep it simple to start. Buying gallons of glutaraldehyde is just not something I would reccomend to someone who has just entered the hobby.
There is no trade secret. Seachem does not promote their product as an algacide. That is just a happy biproduct of using it.
Thank you for providing us a very misleading post. You just refrenced the Wiki Page for Glutaraldehyde
Excel IS Glutaraldehyde. So how is it "alot safer to use and contact"?
To prove a simple point, look at the MSDS for Bleach.
Now some excerpts:
Eye Contact: Hold eye open and rinse with water for 15-20 minutes. Remove
contact lenses, after first 5 minutes. Continue rinsing eye. Call a physician.
Skin Contact: Wash skin with water for 15-20 minutes. If irritation develops, call
Ingestion: Do not induce vomiting. Drink a glassful of water. If irritation
develops, call a physician. Do not give anything by mouth to an unconscious
Inhalation: Remove to fresh air. If breathing is affected, call a physician.
7 - EMERGENCY FIRST AID PROCEDURES
Skin: Wash skin with soap and water.
Eyes: Flush with water for 15 minutes. If irritation persists, seek
Inhalation: Remove to fresh air. If irritation persists, seek medical
Ingestion: Do not induce vomiting. Give large amounts of water.
Seek medical attention.
Which one is Metricide and which one is Bleach?
This product contains no hazardous components as defined in the
OSHA Hazard Communication Standard (29 CFR 1910.1200).
Ingredient Concentration Exposure Limit
Sodium hypochlorite 5 - 10% Not established
Sodium hydroxide <1% 2 mg/m1
CAS# 1310-73-2 2 mg/m2
There is really no reason to be afraid of Metricide 14 in comparison to Excel, and the simple fact is SImple household bleach is more dangerous.
Here is the MSDS for Metricide
To add fuel to fire, here is the MSDS for Seachem Flourish Excel
SECTION VI: HEALTH HAZARD DATA
Route(s) of Entry: Inhalation, Skin, Eyes, Ingestion
Health Hazards (Acute): Inhalation-Irritation to respiratory tract; Skin-Itching, pain; Eyes-Conjunctivitis;
Signs and Symptoms of Exposure: Inhalation-Stinging sensation in nose or throat, possible bleeding from
the nose, coughing, difficulty with breathing; Skin-Itching, redness, swelling, pain; Eyes-Redness,
swelling, discharge; Ingestion-Irritation of digestive tract, pain, nausea, vomiting
Medical Conditions Generally Aggravated by Exposure: Dermatitis, asthma, inflammatory or fibrotic
Emergency and First Aid Procedures: Inhalation-Remove to fresh air; Skin-Remove contaminated
clothing, wash with soap and water; Eyes-Flush with water for at least 15 minutes and seek medical
attention; Ingestion-DO NOT INDUCE VOMITING, do not give water to drink, seek medical help
immediately. NOTE TO PHYSICIAN-Due to the moderately irritating or corrosive nature of the material,
and the potential for lung injury from material aspirated during vomiting, the stomach should be
evacuated carefully, with a method least likely to cause aspiration (e.g., gastric lavage after endotracheal
For the record, Metricide 14 is used in surgery suites as a sterilizer, and on surgical instruments.