Holland Secret - Micro (Hard Water) - Plant Fertilizer

Brand: Future Harvest

Product Code: FHD-0700018

Availability:In stock

$17.49 17.49

Available Options


Recommended for use with Hard Water over 200 ppm

Water quality is a big concern when growing. To obtain optimum results, it is recommended to use water that contains as little salts as possible. Unfortunately, this is not an option for everyone and some are forced to grow using water with a high mineral content. In most cases, problems in water quality arise from higher rates of Calcium (although it’s advisable to do a water test to be certain), and using regular Holland Secret Micro will push Calcium levels too high which increase the chances of having a lockout with the Phosphorus contained in Holland Secret Grow and Bloom.

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.


The best fertilizer for plants

Looking for the best fertilizer for plants? Well you’ve found it!

Introducing the Holland Secret 3-part plant fertilizer.

This 3-part fertilizer helps your plants avoid deficiencies by delivering all 12 essential micro and macro nutrients, and is pH buffered for ease of use, which means less time spent diagnosing plant diseases and more time spent harvesting a large crop.

Holland Secret is regarded as the penultimate plant fertilizer for its ease of use and can be used with any grow medium in any situation, and any part of the grow cycle. And unlike other plant fertilizers, you don’t have to worry about clogged lines, thanks to the technicians at Future Harvest, Holland Secret is sediment and urea free.

Grab the best fertilizer for plants today!



Available sizes shown from 500mL, 1L, 4L, 10L, 20L, 208L, totes of HW Micro



micro hard water guaranteed analysis

Key Features: 

  • This powerful plant fertilizer automatically buffers pH to acceptable levels for growth.
  • 100% sediment free! Which means no precipitation of nutrient salts falling out of solution and becoming unavailable to your plants.
  • Another thing that makes the Holland Tri-Pack the best fertilizer for plants is that it works well for novices and experts alike. As well as being very easy to use, this plant fertilizer gives precise control over feeding schedules.  
  • Extremely low salt index and only the finest raw materials used.
  • Change the ratio between the three bottles to control nutrition for each specific stage of plant growth, as a professional grower would do. 
  • It can be used as a stand-alone without additives or as a complete feed program.

 **Holland Secret Grow, Micro and Bloom are designed to be used in conjunction with one another, and never as stand alone nutrients.








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The Future Harvest online store ships all over Canada and the United States from Canada. We also have a distributor in the United Kingdom, The Growers Wholesale. CLICK HERE for a list of our distributors. 

All orders are processed within 1 business day.

Your order will be marked as fulfilled from the moment it’s been boxed up in the warehouse awaiting for the courier to pick it up. Once your order has been fulfilled, you will receive an email with your tracking number. Your tracking details will appear once the courier has processed the package.

We deliver packages through the following couriers: Canada Post, UPS, Canpar, and Purolator. The courier will be chosen based on the fastest estimated shipping time. 

We currently only ship to PO Boxes across Canada via Canada Post. If you enter a PO box for a US order, we will contact you to provide an alternative delivery address.





In Canada, we offer free shipping over $100 CAD before tax. In the United States, we offer free shipping over $150 CAD. 



All Future Harvest online orders will be shipped out in branded boxes. If you would like discreet shipping, simply request for it in the shipping notes section on the cart page. 



Shipping Times
British Columbia 
2-3 business days 
& Manitoba 
3-5 business days 
Ontario, Quebec,
Newfoundland & Labrador,
& PEI 
3-7 business days 
USA 7-15 business days 



Nutrients can freeze when exposed to cold temperatures. We protect your packages by shipping liquid nutrients with heat packs and faster shipping methods during the winter months. Depending on courier, your package may not be sent out until the following Monday to ensure it does not sit in a cold warehouse over the weekend. If your nutrients freeze, simply mix the entire bottle with an equal amount of hot water (preferably reverse osmosis or distilled water) and double your dosage. For detailed information CLICK HERE

Occasionally, our online inventory is inaccurate. In the case we cannot fulfill your order due to an item being out of stock, we will contact you within 24 hours whether to cancel the order or wait for the item to be back in stock. 

We reserve the right to cancel & refund any order where we cannot economically ship to. If this happens you will be refunded in full and notified of the issue. 


Refund Policy


Our policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.

To be eligible for a return, your item must be unused and in the same condition that you received it. 

To complete your return, we require a receipt or proof of purchase.

Once your return is received and inspected, we will send you an email to notify you that we have received your returned item. We will also notify you of the approval or rejection of your refund.

If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.

Late Refunds
If you haven’t received a refund yet, first check your bank account again.
Then contact your credit card company, it may take some time before your refund is officially posted.
Next contact your bank. There is often some processing time before a refund is posted.
If you’ve done all of this and you still have not received your refund yet, please contact us at marketing@futureharvest.com.

We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at marketing@futureharvest.com and send your item to: 725 Evans Court, Kelowna, British Columbia, CA, V1X 6G4.

To return your product, you should mail your product to: 725 Evans Court Kelowna British Columbia CA V1X 6G4

You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the original cost of shipping will be deducted from your refund, unless you the customer paid the original shipping.

Depending on where you live, the time it may take for your exchanged product to reach you, may vary.

If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.



Ask a Question
  • I'm growing with a living supersoil (NLS) and my tap water can be up to 1,200ppm after sitting for 24hrs dechlorination. My autos are having a tough time starting around week 5. Will your products help me?

    Any tap water over 200PPM can be considered hard water so with your high PPMs we would definitly recommend using Micro Hard Water. Our products can definitly help your plants, however, Holland Secret is not considered organic so your supersoil grow would no longer be an organic grow. With Holland Secret you must use the three parts together, Grow, Micro Hard Water, and Bloom. Please email marketing@futureharvest.com if you have any further questions or contact us on Instagram for instant help! @futureharvestdevelopment

  • Hello, My water has so much calcium that we can see in the glass, cutlery, every pipe get stuck and there is little water coming in the shower. My plants are very "sad, looking down" some leaves are falling. Can I use the 3 products 0-6-4 , 2-1-7, 5-0-2? What would you recommend? Thank-you

    You can use our 3 part system with the Micro Hard Water. We recommend using this for water levels at 200 to 300+ PPM. Monitor your PPM levels as too much calcium can cause a nutrient lockout on your plants.

  • I have the veg, micro, bloom. Should I use additional cal-mag or will I be ok with just the veg, micro, bloom?

    Hello Neil, thanks for the inquiry.
    I would say its not nessecary unless you notice your plants are light green in color or show signs of lacking some calnesium or magnesium. 
    Typically during early flower you could add more Cal-Mag.

    Hopefully this answers your question, please let us know if you have any other questions.
    Best regards

  • Monthly water quality report states that the calcium hardness at a monthly average of 118mg/Lt., reading @160ppm. If I am having Cal/Mag problems can I mix Micro and Micro for hard water together to see if this helps. Thanks, Ed.

    If I understand correctly you would like to supplement your current Micro with additional HW Micro.  While this would likely take care of any low calcium problems it could cause other problems with too many other nutrients, for example too much Nitrogen.  It could also push the TDS too high depending on the stage of growth. Our recommended remedy is to use Calnesium instead since it was designed specifically for this purpose.  The levels of Calcium are higher than HW Micro and the levels of Nitrogen lower.