You are overthinking this.
RO water is not necessary for seedlings, and does not have a pH that means anything.
Switch to tap water, SQUEEZE out your RRs because they don't need more water added than they come with from the factory, and make sure your temps aren't high enough to create mold conditions.
The heating pad may not be necessary; check that you are running about 75-80'F, no more.
stinkyattic Reviewed by stinkyattic on . Slow Germination help? I have a fresh pack of Jack that came from the Dam, and they have been in Rapid Rooters (w/ RO water, 4.9 PH & 015 PPM, amount as directed) sitting on a heating pad in a dark place for almost 10 days and none have sprouted. I have checked them for decay and other ills but the seeds appear to be in a healthy state still. I would normally not use anything that has not sprouted in 5 - 7 days (at most) but I am praying for the Jacks to grow. Any thoughts or suggestions would be greatly Rating: 5