It is not necessary to buy it for inhalation of saline solution and it is not necessary to use it for covid patients.
First, a nebulizer is not a toy. It is not suitable for spraying saline.
A nebulizer is a means of delivering a fine aerosol into the lungs. Drops less than 5 micrometers in size are obtained, which reach the very depths of the soul and settle there.
If there is debris in the nebulizer, it will fly away there. This can cause pneumonia or a severe allergic reaction.
Inflammation of the lungs can be because the nebulizer is difficult to disinfect.
That is, it is theoretically impossible to make a complete sterilization of a household nebulizer. The microbes inside such a nebulizer are usually more resistant than the design of the nebulizer itself. The nebulizer is more likely to fall apart than to be sterilized.
And, secondly, covid patients can your infectious aerosol use a nebulizer to spread over long distances.
Overdose
When people with bronchial asthma or chronic obstructive pulmonary disease use a nebulizer to inhale drugs that dilate the bronchi, then the amount of sprayed preparation corresponds to approximately four or even six puffs from a metered aerosol can, which asthmatics carry in pocket. This is how an overdose turns out. It is more convenient to measure with a spray can.
Shortage
Any nebulizer can be capricious, and then it will not spray correctly. The patient may receive less medication.
Brute force
Part of the solution remains or escapes into the atmosphere. It's wasteful.
Glaucoma
For some people with high intraocular pressure, it is harmful to have asthma medications in their eyes. When such a drug is loaded into a nebulizer, it sprays it all over the room and also gets into the eyes.
Hormones
If hormones are inhaled through a nebulizer, then too much of them then settles in the mouth. From this there is hoarseness or thrush.
Allergy
You can get bronchospasm only because a biofilm with debris of microbes is sprayed from a nebulizer. That is, it is difficult to wipe off the mucus, it then falls off and flies along with the aerosol into the bronchi. Not very helpful.
In short, you cannot buy a nebulizer for inhalation of saline. This is not a harmless contraption.
Have you already gotten snapped?