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A reverse osmosis (RO) deionized (DI) filter system is a water purification system that uses a semi-permeable membrane to remove contaminants and impurities from water. It is a common method used to purify drinking water.

A RO DI system is designed to remove total dissolved solids (TDS) from water, which are dissolved minerals, salts, and other impurities. The goal of an RO DI system is to produce water with a TDS level of 0 ppm (parts per million), which is considered highly purified.

An RO DI system typically includes the following components:

1. Sediment filter: This removes particles such as dirt, sand, and rust from the water.
2. Carbon filter: This removes chlorine, chloramine, and other chemicals from the water.
3. RO membrane: This is the heart of the system and removes a wide range of contaminants, including bacteria, viruses, heavy metals, and pharmaceuticals.
4. DI filter: This removes dissolved minerals and ions from the water, producing highly purified water with a TDS level of 0 ppm.

By passing water through these various filters, an RO DI system can produce highly purified water with a TDS level of 0 ppm. This water is often used in laboratory and industrial settings where extremely pure water is required.

99.9% pure silver, also known as fine silver, is a high purity form of silver that is used in a variety of applications. It is characterized by its high level of purity, which is 99.9% or greater.

Fine silver is a soft, ductile metal that is highly conductive and has a bright, white color. It is often used in the production of jewelry, silverware, and other decorative items. It is also used in the production of electronic components and in the medical field as a wound dressing.

Fine silver is typically produced through the refining of silver ore, which involves a series of chemical processes to remove impurities and produce a high purity metal. It is often alloyed with other metals, such as copper, to increase its strength and durability.

The purity of fine silver is typically measured in parts per thousand (ppt). A purity of 999 ppt indicates that the silver is 99.9% pure, while a purity of 9999 ppt indicates that the silver is 99.99% pure. Fine silver with a purity of 999 ppt is commonly used in the production of silver coins and bullion.

There are many skin conditions that can be caused or exacerbated by bacterial infections. Some examples include:

1. Impetigo: A contagious skin infection that is characterised by red sores that can break open and crust over. It is most commonly seen in children.
2. Folliculitis: An infection of the hair follicles that can cause red bumps and pus-filled lesions on the skin.
3. Cellulitis: A deep skin infection that can cause redness, swelling, and warmth in the affected area. It can be serious if not treated promptly.
4. Boils: A bacterial infection of a hair follicle that causes a painful, pus-filled lesion to form on the skin.
5. Abscess: A collection of pus that is surrounded by inflamed tissue. Abscesses can occur anywhere on the body and can be caused by a bacterial infection.
6. Acne: A common skin condition that is caused by the buildup of oil and bacteria in the pores.

There are many skin conditions that can be caused or exacerbated by fungal infections. Some examples include:

1. Athlete’s foot: A fungal infection that affects the feet and is characterised by itching, redness, and scaling.
2. Jock itch: A fungal infection that affects the skin of the groin area and is characterised by itching, redness, and a rash.
3. Ringworm: A fungal infection that affects the skin, scalp, or nails and is characterised by a circular rash with raised edges.
4. Candidiasis: A fungal infection that can affect the skin, mouth, or genital area and is characterised by itching, redness, and discharge.
5. Tinea versicolor: A fungal infection that affects the skin and is characterised by light or dark patches on the skin.
6. Onychomycosis: A fungal infection of the nails that can cause the nails to become thick, discoloured, and brittle.

There are many bacterial infections that can affect dogs. Some examples include:

1. Dermatitis: This is an inflammation of the skin that can be caused by a bacterial infection. It is characterised by redness, itching, and the presence of pustules or scabs on the skin.
2. Otitis: This is an infection of the ear that can be caused by bacteria. It is characterised by ear pain, swelling, and discharge.
3. Urinary tract infection: This is an infection of the bladder or urinary tract that can be caused by bacteria. It is characterised by frequent urination, discomfort while urinating, and blood in the urine.
4. Respiratory infection: This is an infection of the respiratory system, such as pneumonia, that can be caused by bacteria. It is characterised by coughing, difficulty breathing, and discharge from the nose or eyes.
5. Gastroenteritis: This is an infection of the digestive system that can be caused by bacteria. It is characterised by diarrhea, vomiting, and abdominal pain.
6. Septicemia: This is a serious infection of the bloodstream that can be caused by bacteria. It is characterised by fever, weakness, and rapid breathing.

There are several fungal infections that can affect dogs. Some examples include:

1. Dermatophytosis: This is a fungal infection of the skin, hair, or nails that is caused by dermatophytes. It is characterised by hair loss, scaling, and crusting of the skin.
2. Ringworm: This is a fungal infection of the skin that is characterized by a circular rash with raised edges. It is highly contagious and can be transmitted to humans.
3. Aspergillosis: This is a fungal infection of the respiratory system that can cause coughing, difficulty breathing, and nasal discharge.
4. Candidiasis: This is a fungal infection of the skin, mouth, or genital area that is characterised by itching, redness, and discharge.
5. Blastomycosis: This is a fungal infection that can affect the respiratory system, skin, or other organs. It is characterised by fever, cough, and weight loss.