NETI

A.  Jala Neti (Cleaning the nasal passage)
Sthiti:Tádásana
Practice
Add about half a teaspoon of salt to a neti pot full of sterile lukewarm water.
Stand with the legs apart
Hold the neti pot in your right hand.
Insert the nozzle of the Neti pot into the right nostril.
Keep the mouth open and breathe freely  through the mouth.
Tilt the head first slightly backwards, then forwards and sidewards to the left so that the water from the pot enters the right nostril and comes out through the left by gravity.  Allow the flow till the pot is empty.
Repeat the same on the left side.
To clear the nasal passages of the remaining water, blow out the water by active exhalation through alternate nostrils as  in Kapálabháti.

Benefits
It helps to clear nasal passages. Removes cold, hypersensitivity, headache, sinusitis, bronchitis and stimulates olfactory nerves.

Limitations
Neti should be avoided if you have had a recent ear infection or nasal septum operation. Also avoid neti for a few days after a bleeding nose.

B. Sütra Neti Or Rubber Catheter Neti

Sthiti: Táãásana
Practice
Insert the blunt end of a thin soft rubber catheter horizontally into the right nostril.
Gently push it along the floor of the nose until the tip is felt in the back of the throat.
Insert the right index and the middle finger through the mouth and catch the tip of the catheter at the back of the throat.
Pull it out through the mouth and gently massage the nasal passage by catching the two ends of the tube.
Remove the catheter through the nose.
Repeat on the left side.

Note
Take care not to push the catheter vertically into the nostril.
Before you start this practice, cut and trim the nails of the fingers to be used for inserting in the mouth, as it may injure the throat when you are trying to grasp the tip of catheter in the throat.  

Benefits
 Clear  the nose and pharynx. Tremendous will power increased in process of catheter insertion. Desensitizes to dust pollution etc. in nasal allergy patients.
Limitations
Same as jalaneti plus, back pain, hypertension, cardiac problems.  Avoid during latter part of pregnancy.

C.  Sitkarma Kapála Neti
l     This is similar to Jala Neti, with the difference that the water comes out of mouth instead of through the opposite nostril.

D.  Vyutkarma Kapála Neti
Take a mouthful of luke-warm saline water.
Bend forwards and relax the soft palate so that the water comes out of the nose.
Neti Kriya is to be followed by a few rounds of Kapálabháti, so as to keep the nasal passage clear.

Benefits
Neti, in general, purifies  most structures in the head  and neck. Neti not only clears the nasal passages but also renders the nose resistant to  many  irritants  like water, cotton, rubber, ghee, milk etc. Hence it  is  very  helpful  in  removing  the  hypersensitivity  as  seen  in  persons  suffering from Allergic Rhinitis.Vision becomes more subtle.