maintaining and keeping ph level

howdy all..

using DWC got 5 gallon buckets with approximately 3.5 gallons of distilled store-bought water. the water starts off at ph of about 7.6 or so which i thought was kind of high for store bought distilled. we have a ph meter, general hydroponics ph down. the issue is, after i put some ph down in the water and get it down to about 5.7, it seems like it shoots back up in an hour or two. I can only ph check it once or twice a day. is there any way to make the ph level stay? These are clone buckets with plain water, no nutrients/additives
 
i'll try it but i'm unfamiliar with this method of using lemon peel, does the lemon peel actually drop the ph or do i just put a peel in there and it will keep the ph in check
 
Its ph drift. it should go back to normal. ive been using the same nute mixes for years with ro filtered water. I dont even check the ph anymore all i check is the ppm level.
 
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