ph going up?

Using coco perlite mix 70/30. Normally put 5.8 to 6.2 ph. Well I was draining my plant from a nuet issue I tested the drainage and UT was coming out as 7.3 ph. Using go box nuets. Why would the water be coming out such a high ph

Correct me if I'm wrong, but you poured tap water into coco, and then tested the runoff?

Or are you watering with a nutrient solution? It sounds like you're not watering with nutrients.

Normally ever water is neuts. And yes tap water it's been phed and left it sit for 48 hours to remove the chlorine all I added to the water this time was 7.5ml calmag to fix my cal deficiency

Mag/Calcium, these cause great upward swing's in Ph...

DevChronics said:

Using coco perlite mix 70/30. Normally put 5.8 to 6.2 ph. Well I was draining my plant from a nuet issue I tested the drainage and UT was coming out as 7.3 ph. Using go box nuets. Why would the water be coming out such a high ph

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Minerals in the water, such as chlorine and fluoride, may cause the pH to fluctuate in soil. Try using RO water instead of just tap.

City tap water is often treated w Chloramine. Even after letting it sit for a couple days, it will try to buffer the ph to a neutral, or near neutral state- usually to the slightly acidic side. I had this problem using my tap water in hydro. After a point, the ph adjusting solution will exhaust the buffering qualities of the chloramine, and the ph will stabilize.
I've mentioned this on previous posts, and dawn some fire and ridicule from the "pros", who claim that this simply does not happen. I have several friends who work for the city, w/ a couple who work for the water dep., who have confirmed, beyond a doubt, that yes, this DOES occur- by design. The chloramine is added to prevent fluctuation swings in ph.