PH run off way low

I just did a test with just the light warrior in 2 solo cups. 1st with distilled water 7.0ph in and 6.5 out. then I used my tap water 7.0 in and 6.0 out. Now I am really confused, I will retest plants next water in/out ph. possibly my reused planters causing issue?

@Jennifer I would recommend that you buy one of these meters for pH measuring. It and a TDS meter go a long way to having a successful grow.

Already ordered thanks.

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@Jennifer water temps can also affect the pH Only explanation that comes to mind!