Shop / Premium Soil & Amendments from Paonia Soil Co. > Paonia Soil pHD Soluble Organic Critic Acid

Paonia Soil pHD Soluble Organic Critic Acid

pHD is a simple, effective solution for lowering water pH and creating the ideal conditions for plant growth. Made from organic citric acid, it helps bring overly alkaline water into a range where plants can properly absorb nutrients and thrive.

In many regions—especially areas with well water—high pH can lead to nutrient lockout, reduced microbial activity, and slower plant performance. pHD allows you to fine-tune your water before it ever reaches your soil, improving nutrient availability and overall plant health.

Unlike synthetic pH adjusters, this formula is free from heavy metals and harsh chemicals, making it safe for living soil systems and beneficial microbes.

Whether you’re growing in soil, raised beds, or a greenhouse, pHD gives you consistent control over one of the most important (and often overlooked) factors in plant success.

Best For:

  • Lowering pH in well or irrigation water
  • Preventing nutrient lockout
  • Living soil and organic growing systems
  • Greenhouse, raised bed, and container gardening

MUST PICK UP IN PAGOSA SPRINGS, CO. If you are unable to pick up from our facility, there are other retailers that you can purchase from.

Size: 4.8 oz

$9.95

Pickup available at Pagosa Springs Facility.

Usually ready in 5+ days

View store information

Questions?  Call us at 800-753-9333. 

Our friendly Growing Dome Advisors are experts at helping you choose a geodesic greenhouse kit configuration for your climate and unique needs.

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