Mixing Instant ocean reef crystals

Themastaa

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I mixed a batch of instant ocean reef crystals 8 gallons at 1.025 and I tested the water and the p.h is 8.0 calcium 460 alkalinity 7. I’m using ro water. Why is my alk a 7? Please help
 

Being sticky and staying connected: Have you used any reef-safe glue?

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