How often must it be used?
1397869
I do each time I wash my hair. I recommend if you want to grow your hair faster, to only apply shampoo/conditioner in it (at the most a week) every other day at the most.
1397870
I use it off and on, it is good for your hair, but I use it regularly. If my hair needs washed, I use it.
1397871
Just use it like you would normal shampoo & conditioner. But for good hair growth results (I've done a bit of research the past 2 years) at the most, only wash your hair every other day (it needs a rest).
339167
It depends on how hard your water is & how often you shower. I would recommend every 6 months, & not less than annually under normal water conditions.
2158460
I use it once or twice a week. I have used it for a while now - so I can feel when I need to use it.
2029349
I have used this for a number of years and twice is normally all you need to use it. Even once will do in many cases. The timing of use is important. It should be used when the water table is low and more often if there are long periods of dry weather. Tree and shrub roots will seek out water at a long distance when the ground is dry.
720566
that depends on usage, every other day unless you are a heavy user. Than once a day.
1851409
depends how often it runs, but in my case with very heavy constant use I'm changing 2-3 times per year. Basically fall, winter and spring (not used in summer).
1501156
I only used it once or twice and it worked. Your question makes me wonder though!
511332
As many times as it holds up. 10-20 times if you do it right and take care of it.
395294
I only use it when I know there will be a high stress situation. I don't know about consistent usage. I do know it works per situation but I do double sometimes triple the recommended dosage.
1455301
i bought this product at least 2 month ago,and always used it.i think it can be used 1 year or more.
1241234
It can be used over and over. It will probably last a few years. Easy clean with soap and water.
957175
I didn't use it for its original purpose, so I don't know how long it lasts. I suppose it depends on how much and how often you use it.
1001278
You can use it as many times as you want. The battery is the only thing that needs to be replaced. My battery lasted roughly 2 months of HEAVY usage. The device will let you know that the battery is low when maybe 5% charge is remaining.
651432
It is difficult to say since I have used once,washed it and have kept aside for future use. So I have no clue how many times it is safe to use. Once you find out, please let me know. I am curious to know. Thank you.
1743002
Instruction book says once every 60 days if used every day - or once every 60 uses - or more often if water is especially hard.
625073
I don't believe there's any limit to how often you can use it; you can use it every day if you like. However I think once a week may be okay. I usually leave it on till I get sick of it; but generally I'd say half an hour would be sufficient.
2076037
I use it every other watering, so about every other week, but that is just based on my needs and there are probably a bunch of variables that would determine how often you would want to use it. I know certain plants recommend more or less frequent fertilizing.