Everything you need to know about ATAMI WSP, in one place. Find practical answers about the 3-part nutrient system, stock solution preparation, mixing order, EC and pH, compatibility, storage and system maintenance. Whether you are setting up ATAMI WSP for the first time or fine-tuning an existing cultivation strategy, these FAQs help you prepare clean, consistent nutrient solutions and use the system with confidence.
The ATAMI WSP 3-part system gives growers greater control over plant nutrition throughout the cultivation cycle.
During vegetative growth, WSP-A and WSP-B provide a complete nutritional foundation. During flowering, WSP-C is added to increase phosphorus, potassium, sulphur and iron, allowing growers to steer crop development instead of following a fixed nutrient program.
Compared with traditional 1- or 2-part systems, the 3-part design offers greater flexibility to match changing plant nutrient requirements while maintaining excellent solubility.
ATAMI WSP is designed for both commercial and craft growers looking for a clean, highly soluble and flexible nutrient system suitable for modern cultivation.
Although ATAMI WSP can be mixed directly into the reservoir, preparing a stock solution is highly recommended. Stock solutions improve dosing consistency and help prevent small impurities from entering the irrigation system.
Always use the complete bag or container when preparing a nutrient solution. Using only part of the powder may result in an uneven nutrient composition.
Always prepare separate stock solutions for WSP-A, WSP-B and WSP-C.
When preparing the nutrient solution:
Never mix concentrated stock solutions together.
No. Always prepare separate stock solutions.Â
Mixing concentrated stock solutions together may cause precipitation and reduce nutrient availability. Only combine the products when they are being diluted into the irrigation water, one by one.
Yes. WSP-A and WSP-B provide complete nutrition during the vegetative stage. WSP-C is introduced only during the generative (flowering) phase to supply additional phosphorus, potassium, sulphur and iron.
Begin using WSP-C at the start of the generative (flowering) phase. WSP-C complements WSP-A and WSP-B by supplying additional phosphorus, potassium, sulphur and iron during flowering.
Always follow the recommended Grow Guide. Target EC depends on crop stage, cultivar, environment, irrigation strategy and light intensity.
Adjust nutrient strength based on EC measurements rather than fixed dosages.
Yes. After preparing the nutrient solution, adjust the pH if necessary according to the recommended pH range for your growing substrate.
No. When the recommended Grow Guide is followed, WSP provides sufficient calcium and magnesium under normal growing conditions.
No. ATAMI WSP provides complete plant nutrition throughout the cultivation cycle. Bloom stimulators are optional and may be used according to the grower’s cultivation strategy.
Yes. ATAMI WSP is compatible with most irrigation systems, including drip irrigation, hydroponics, fertigation systems, dosing units and direct-to-reservoir applications.
No. When the recommended mixing procedure and stock solution preparation are followed, ATAMI WSP produces clean nutrient solutions that should not clog irrigation systems or leave residues on the short-term. However, any nutrient solution will eventually start scaling and/or clogging, if you leave it in the lines too long and/or if you don’t clean your systems regularly.
Yes. ATAMI WSP has been tested on hydroponic systems, stonewool, coco coir and peat-based substrates.
Yes. ATAMI WSP is compatible with a wide range of water sources.
Reverse osmosis or demineralised water is recommended because it provides the most consistent starting point for nutrient preparation.
However, ATAMI WSP has also been successfully tested with groundwater and other water sources.
ATAMI WSP is compatible with many cultivation additives. Because not every product has been tested, always perform a small compatibility test before large-scale use.
Silica, beneficial microbes and bloom stimulators may be compatible depending on the specific product.
Store in the original packaging, tightly sealed, in a cool, dry and wellventilated location protected from direct sunlight.
Recommended storage temperature is between -10°C and 45°C.
ATAMI WSP has been formulated to remain highly soluble while reducing clumping and sludge formation compared with many other powder fertilisers. The nutrient ratios have been carefully optimized to deliver consistent performance across a wide range of cultivation conditions.
Yes. ATAMI WSP has been extensively tested in controlled greenhouse environments and is equally suitable for fully controlled indoor cultivation.
Cloudiness usually results from insufficient mixing between nutrient additions or precipitation caused by adding concentrated stock solutions simultaneously. Always add each stock solution separately and mix thoroughly before adding the next.
Use reverse osmosis or demineralised water at approximately 35°C. Add the powder slowly while mixing vigorously, allow the stock solution to stabilise for 24 hours, then stir thoroughly before use.
Batch tanks should generally be cleaned every 10–14 days, depending on water quality and facility conditions.
A thorough cleaning every 1–2 times per month is generally recommended.
Yes. Certificates of Analysis are available for every production batch.
Yes. ATAMI WSP products are EU Fertilising Products and comply with EU Regulation (EU) 2019/1009.
Commercial growers can contact their account manager directly.
For general product support, please contact ATAMI through www.atami.com or contact your local ATAMI distributor.
Finishing Bloom Additve
Direct plant available Silicon Additive
