If you have a kH of 4 and your pH was 5 then you would have had a tank full of dead fish. And I can't believe that DIY would give you a full two point drop in the pH. I don't think I could do that with my pressurized system. And I have very soft water. Out of the tap I have 0 kH and 0 gH. I normally run my tanks at a kH of around 3-4.
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