🌟 Have you seen our 2024-2025 Product Catalogue? Check it out right here! 🌟

Shipping calculated at checkout.

Leave a Review or Share Our Products Online for a Chance to Receive Exclusive Discounts and Coupon Codes.

Holland Secret Hard Water Micro - Product Information

Since 1996, gardeners in areas with hard water have relied on Holland Secret Hard Water Micro for their plants' nutrition. This formula is specifically designed for water sources with 200PPM (0.4EC) or higher. As a crucial component of the Holland Secret 3-part nutrient system, it provides all necessary micronutrients from seedling to maturity, ensuring strong, healthy growth in hard water conditions. It's a perfect alternative to the standard Holland Secret Micro when dealing with hard water.

Use it in combination with Holland Secret Grow during the vegetative stage, and transition to Holland Secret Bloom as your plants enter the flowering phase. This adjusted trio continues to be the cornerstone of flourishing gardens, now accommodating those with hard water sources.

Jarpreet on July 15, 2021

Good for Hard Water

I live in Ontario and we have hard water. I was struggling with it and my plants until I found Future Harvest and their hard water formula. The nutes I was using before didn't offer a hard water formula so I didn't know it was a thing. I'm using their whole line now and I'm really happy with it. Thanks Future Harvest for the help!

Directions for Use

For vigorous growth and optimal results, adhere to these guidelines:

  • 💧 Shake Well: Ensure Holland Secret Micro is well mixed before measuring.
  • 💧 Order of Mixing: Begin by adding Micro to your water, stirring thoroughly before adding Grow and Bloom.
  • 💧 Gradual Combination: Introduce each nutrient one at a time, mixing well to prevent nutrient lock-out.
  • 💧 Frequency of Application: Apply the nutrient solution twice per week, adjusting based on plant response and growth stage.
  • 💧 Maintenance: Maintain clean equipment to ensure optimal nutrient uptake.
  • 💧 Complete Nutrition: Use Grow, Micro, and Bloom in tandem for a comprehensive feeding regimen throughout your plant's lifecycle.

Dilution Rates

Dilution rates are intended as a guideline and should be modified based on individual plant needs, growth phase, and environmental conditions.

Growth Stage Target EC Target PPM Metric (per 4 liters) Imperial (per gallon)
Seedlings & Cuttings 0.3 170 1.2 ml ¼ tsp
Early Vegetative 1.3 770
5 ml
1 tsp
Late Vegetative 2.3 1170
7.5 ml 1½ tsp
Early Flower 1.6 800 5 ml 1 tsp
Late Flower 2.2 1080 7.5 ml
1½ tsp

Minimum Guaranteed Analysis







Derived from: The nutrients in Holland Secret Hard Water Micro are derived from a range of high-quality sources including calcium nitrate, potassium nitrate, ammonium nitrate, copper nitrate, zinc nitrate, boric acid, sodium molybdate, iron EDTA, and iron DPTA


Compliance and Certifications

For those interested in the regulatory compliance and detailed composition of our product, we transparently provide all pertinent information. To verify our adherence to the rigorous standards set by the Oregon Department of Agriculture, please visit our certification page.

Furthermore, detailed information regarding the contents and levels of metals in Future Harvest products can be reviewed at the Association of American Plant Food Control Officials (AAPFCO) website.

Canadian customers can access our product’s compliance details with the Canadian Food Inspection Agency's regulations at their fertilizer database.

Future Harvest Nutrient Calculator

By entering your specific grow details, our Nutrient Calculator will outline the total amounts of Future Harvest products needed to take your plants from seeding to harvest, ensuring you're fully prepared for every stage of growth.

Growing with Hard Water

Growing with Hard Water