High pH problems
 

Hey guys new to the this forum and hydroponics in general. I'm at seeldlig stage on my first grow and have had a problem I've been trying to solve for a week now with no success and more than a few pennies seemingly wasted. It's a DWC and my problem is that no matter how much I drop the pH within a matter of hours it returns to 7.6 - 7.8. I have looked everywhere for solutions and o one seems to be able to offer a solution. I'm hoping someone here can point me in the right direction. I've spent far too much money on the setup to give up now and am determined to figure this out but it feels like it's starting to get the better of me. I have been recording pH and EC reading over the last five days and can post them if it will help. Thanks in advance for any help and I will praise the one who saves me from going bald from pulling my hair out.