Hi D.,
I love the neti pot and my husband loves it too. Warm tap water with a little salt goes into it; it is crucial to closely watch how hot the water is, and not to put in too much salt (we use non-iodized sea salt, but I don't know how important that is). Obviously water that is too hot hurts a lot, and so does too much salt. But the neti pot definitely helps to manage allergies and to fend off sinus infections. For me, I started to want something that would exert more force to clear the sinuses and have moved over to the gravity neti pot that is sold in drugstores, and the plastic squeeze bottle, both of which come with pre-measured salt packets and both of which push the water through the sinuses with more force. I find these to work better and to be quicker -- the regular neti pot is harder to use over a bathroom sink, but the plastic bottle I can use three times a day with no trouble. I think this is a wonderful tool; as someone with allergies, asthma, and a penchant for sinus an bronchial infections, without the general approach of sinus irrigation I'd spend a lot more time sick and, I suspect, would have had multiple hospitalizations. I should add that one key principle to fend off either a sinus infection or a serious allergy attack is to use the neti pot, or whatever, early and often -- when I've been 'too busy" to notice that things are starting to get bad and haven't gotten going until whatever the sinus issue is has had time to settle in, it takes longer and I still spend time feeling awful. Finally, for those who find this to be effective but want more, Waterpick sells a waterpick machine with a nasal attachment that is bizarre but incredible -- a friend of mine who gets regular sinus infections multiple times per winter has found that she doesn't have this pattern at all when she goes after early congestion with the waterpick, and I've found it very helpful too, although I lost the attachment and now use the plastic bottle and suspect it is almost as good, and it costs well over $100 less (and looks less bizarre, takes less space, travels, and has less little parts to lose)
All the best!
M.