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The Ultimate Plant Fertilizer for Hard Water
Water quality is a crucial factor when growing plants. For optimal results, it's recommended to use water with minimal salts. However, this isn't an option for everyone, and some growers have to use water with high mineral content. In most cases, water quality issues arise from higher calcium levels, which can lead to nutrient lockout when using regular Holland Secret Micro.
Introducing Holland Secret Hard Water Micro, the ultimate solution for those dealing with hard water over 200 ppm. This 3-part plant fertilizer delivers all 12 essential micro and macro nutrients, and is pH buffered for ease of use. Spend less time diagnosing plant diseases and more time enjoying a bountiful harvest.
Holland Secret Hard Water Micro is designed for ease of use and can be used with any grow medium, in any situation, and at any stage of the grow cycle. With Future Harvest's sediment and urea-free formula, you won't have to worry about clogged lines.
Experience the best plant fertilizer for hard water today!
AVAILABLE SIZES

Key Features:
- Automatically buffers pH to optimal levels for growth.
- 100% sediment-free, preventing nutrient salts from falling out of solution and becoming unavailable to your plants.
- Suitable for both novices and experts, offering precise control over feeding schedules.
- Extremely low salt index and only the finest raw materials used.
- Adjust the ratio between the three bottles to tailor nutrition for each specific stage of plant growth.
- Can be used as a stand-alone or as part of a complete feed program.
GUARANTEED ANALYSIS

Additional Info
Use all three parts of the Holland Secret 3-Part plant fertilizer together for optimal results. Using only one or two parts, like Grow and Bloom without Micro, could lead to nutrient deficiencies.
For those who do not want to spend money on a lab test, it is advisable to monitor water quality using a nutrient meter. At levels between 200 and 300 PPM, it is advisable to use Hard Water Micro, together with Calnesium, to balance out Calcium levels. Any tap water over 350 PPM should only use Hard Water Micro without Calnesium.
Downloads and Schedules
For more information on how to use Holland Secret Hard Water Micro, please refer to our Downloads and Schedules tab.
Customer Reviews
Disclaimer
The values provided on these feeding charts are meant as a general growing guide.Results may vary based on such factors as genetics, environment, and water quality.It is up to the end user to make the necessary adjustments based upon their individual situation.
Fine-Tune your Feed - Click To Explore Our Nutrient Calculator
FEED SCHEDULES AND GROW GUIDES |
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FUTURE HARVEST 8 WEEK FEED SCHEDULE: SOIL (mL per gallon) An 8 week liquid feed schedule used for: Soil, COCO, and Soil-less growing mediums. Click here to Download PDF |
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FUTURE HARVEST 8 WEEK FEED SCHEDULE: HYDRO (mL per gallon) An 8 week liquid feed schedule used for: a hydroponic growing system. Click here to Download PDF |
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FUTURE HARVEST 8 WEEK POWDER FEED SCHEDULE: SOIL (grams per gallon) An 8 week powder feed schedule used for: Soil, COCO, and Soil-less growing mediums. Click here to Download PDF |
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FUTURE HARVEST 8 WEEK POWDER FEED SCHEDULE: SOIL (tsp per gallon) An 8 week powder feed schedule used for: Soil, COCO, and Soil-less growing mediums. Click here to Download PDF |
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EASY PLUS SERIES APPLICATION GUIDE The Easy Plus Series application guide. Used for: Soil, COCO, and Soil-less growing mediums. Click here to Download PDF |
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EASY PLUS SERIES GROW GUIDE An easy to understand grow guide on using our Easy Plus Series powders. Click here to Download PDF |
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FUTURE HARVEST 8 WEEK AUTO-FLOWER FEED SCHEDULE An 8 week liquid feed schedule specifically designed for auto-flowering plants. Click here to Download PDF |
Take a look at our Media Kit. Loaded with all of our product photos, marketing materials, and our latest Product Catalogue!
If you are having troubles understanding the Feed Schedules, check out this Blog Article!

SAFETY DATA SHEETS / CERTIFICATES OF ANALYSIS
SDS | COA | LABEL / PDS | |
HOLLAND SECRET - MICRO | EN / FR | COA | LABEL / PDS |
HOLLAND SECRET - GROW | EN / FR | COA | LABEL / PDS |
HOLLAND SECRET - BLOOM | EN / FR | COA | LABEL / PDS |
CALNESIUM
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EN / FR | COA | LABEL / PDS |
PLANTACILLIN
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EN / FR | COA | LABEL / PDS |
HARD WATER MICRO
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EN / FR | COA | LABEL / PDS |
EASY GROW PLUS | EN / FR | COA | LABEL / PDS |
EASY BLOOM PLUS | EN / FR | COA | LABEL / PDS |
SUPER B+ | EN / FR | COA | LABEL / PDS |
ROYAL GOLD | EN / FR | COA | LABEL / PDS |
ROYAL BLACK | EN / FR | COA | LABEL / PDS |
PROP-O-GATOR | EN / FR | COA | LABEL / PDS |
CARBO BLAST | EN / FR | COA | LABEL / PDS |
BUD START | EN / FR | COA | LABEL / PDS |
TON O BUD | EN / FR | COA | LABEL / PDS |
BUD BOOM | EN / FR | COA | LABEL / PDS |
SILICA UP | EN / FR | COA | LABEL / PDS |
pH UP | EN / FR | COA | LABEL / PDS |
pH DOWN | EN / FR | COA | LABEL / PDS |
ORGANICAL MAGIC | EN / FR | LABEL / PDS | |
SURGE PLUS | EN / FR | COA | LABEL / PDS |
CARBO BLAST POWDER | EN / FR | LABEL / PDS | |
BUD START POWDER | EN / FR | LABEL / PDS | |
TON O BUD POWDER | EN / FR | LABEL / PDS | |
BUD BOOM POWDER | EN / FR | LABEL / PDS | |
PLANT FLUSH | EN / FR | LABEL / PDS | |
CITRIC DOWN | EN | LABEL / PDS | |
ISOPROPANOL 99% | EN | LABEL | |
H2O2 29% | EN | LABEL / PDS | |
SUCK IT UP | EN | LABEL | |
VEG BOOM PLUS | EN | LABEL | |
NUTRADIP pH4 | EN | LABEL | |
NUTRADIP pH7 | EN | LABEL | |
NUTRADIP 1000PPM | EN | LABEL | |
VGC - COMMON | EN | LABEL | |
VGC - GROW | EN | LABEL | |
VGC - BLOOM | EN | LABEL |