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I use the Ayr Saline Nasal Mist primarily, also I grab the Ayr Saline Aloe Gel. These are my goto ones, I really like the Simply Saline Nasal Mist by Arms and Hammer however they are expensive and run out really fast so I use occasionally, I only recommend it because it leaves no bad "aftertaste" in my mouth if I need to spray it further down my nasal till it flushes everything out and enters the throat, Ayr is tolerable with this while others tend be nasty from my experience. Another tip I'll give you is that bulk 6 Ayr Saline sprays are really cheap on amazon and my recent package came with small sample aloe gels included with the sprays so you can save money that way. Spraying your nose before, and 15 minutes after helps and gel helps keep your nose going and prevent damage. The Simply Saline spray can be used at the end to clear your entire nasal.
Another helpful resource I found is that if you are low on money, you can just buy 1 Saline Spray, use it up then recycle it by making your own saline spray it only requires water and a small dash of salt but do read up how much salt you need because its fairly easy to put too much.
For the solution itself, you will need either a proper measured (Usually pharmaceutical grade) spray delivery bottle (I purchased these ones). Or you will need to figure out how much your current spray bottle can deliver, the saline spray bottles arent ideal because they spray a lot and unevenly. I use distilled water, heated up real nice and add the chemical desired. For the one I mentioned, a gram of said chemical and 10 ml of water will deliver 10mg dose per spray and you can experiment and find the right dose. Mixing it till the water is clear enough is vital and do use a proper milligram scale and a cup measure (check your medical syrup bottles sometimes they have small ones) its essential to get measurements exact or risk ruining it. I also tend to add a little saline spray in the solution as well.
I'm not much of an expert, You can probably add other ingredients to make it even less caustic and effective but I find what I have satisfactory and good to redose just be careful since they dont clog up your nose fast you might feel the need to redose more frequently.
[the bottle delivers 0.1ml per spray and carries 10ml, the formula is weight of chemical (in g) / total capacity of bottle (in ml) * Amount delivered with each spray (in ml) feel free to correct this if I made a mistake somewhere but I think that is how it goes]