What is Reddit's opinion of DILISS Digital PH Meter/PH Tester/Mini Water Quality Tester for Household Drinking Water, Hydroponics, Aquariums, Swimming Pools, 0.1PH Resolution - Extra PH Calibration Solution Mixture?

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This same advice goes for OP /u/TheNovaForce as well:

I had a similar issue. Get a PH tester like this one: https://smile.amazon.com/gp/product/B072JVRPFY/ and swish it around in the water for a good 30 seconds or so to get a reading. If the number is less than 7.0, you have acidic water which is eating through your copper pipes - anything below 6.5 is basically a "fix this ASAP" situation. You'll need to add an acid neutralizer (I used this one: https://www.midatlanticwater.net/shop/acid-neutralizers/non-backwashing-acid-neutralizers/acid-neutralizer-10x54-non-backwashing-wbypass ) and you'll want to get your pipes checked and possibly replaced if they have signs of pinhole leaks or corrosion.

If you don't have acidic water, then either a toilet cleaning tablet got stuck in your toilet somewhere (under the flap or in the throat of the toilet where the tank drains into the bowl, perhaps?), OR you have a bonding issue like /u/Waspy1 indicated and should have an electrician come take a look

PH tester: $18 https://www.amazon.com/DILISS-Household-Hydroponics-Aquariums-Resolution/dp/B072JVRPFY/ref=redir_mobile_desktop?_encoding=UTF8&dpID=519gyBWGUxL&dpPl=1&keywords=pH%20digital&pi=AC_SX236_SY340_FMwebp_QL65&qid=1517523343&ref=p...

PH calibration solutions: $13.69 https://www.amazon.com/General-Hydroponics-4-01-Calibration-Solution/dp/B017H73794/ref=redir_mobile_desktop?_encoding=UTF8&dpID=51Kpq0j-fmL&dpPl=1&keywords=general%20Hydroponics%207.0&pi=AC_SX236_SY340_QL65&qid=1517523500&r...

All you need. Mine has lasted 4 years with very little calibration needed. Test it using these 2 solutions at least before every grow.