Water Soluble Potassium

  • Di-Potassium Phosphate 0-41-54

    Di-Potassium Phosphate 0-41-54

    Acid-free phosphate fertilizer for Nutrigation and foliar application   Soil pH is...

    Di-Potassium Phosphate 0-41-54

  • Haifa GrowClean potassium polyphosphate

    Haifa GrowClean potassium polyphosphate

    Haifa GrowClean™ - Sodium free phosphate fertilizer with cleaning effect Keeping the...

    Haifa GrowClean potassium polyphosphate

  • MagPhos

    MagPhos

    MagPhos 0-55-18+4.2Mg is a Nitrogen-free, white crystalline, fully soluble, free-flowing Magnesium fertigation...

    MagPhos

  • Mono-Potassium Phosphate 0-52-34

    Mono-Potassium Phosphate 0-52-34

    Mono-Potassium Phosphate (MKP) 0-52-34 FertilizerMKP is the most concentrated straight fertilizer containing...

    Mono-Potassium Phosphate 0-52-34

  • PeKacid 0-60-20

    PeKacid 0-60-20

    PeKacid 0-60-20 is ICL SF’s patented water-soluble PK fertilizer which is ideal...

    PeKacid 0-60-20

  • Potassium Chloride 4 lb.

    Potassium Chloride 0-0-60

    Potassium Chloride 0-0-60

  • Potassium Hydroxide

    Potassium Hydroxide

    Potassium hydroxide flake, caustic potash 0-0-75 FERTILIZER GRADE Hazardous material, CORROSIVE Produced...

    Potassium Hydroxide

  • Potassium Magnesium Sulfate — Water Soluble Potassium Source

    Potassium Magnesium Sulfate — Water Soluble Potassium Source

    Potassium Magnesium Sulfate (KMS) — Natural Chloride-Free Potassium Source Potassium magnesium sulfate...

    Potassium Magnesium Sulfate — Water Soluble Potassium Source

  • Potassium Nitrate 20 lb.

    Potassium Nitrate – Water Soluble Potassium Source

    Potassium Nitrate (KNO3) – Water Soluble Potassium SourcePotassium nitrate provides an ideal...

    Potassium Nitrate – Water Soluble Potassium Source

  • Potassium Silicate

    Potassium Silicate

    AgSil® Potassium Silicate: Soluble Silicate for Agriculture AgSil® potassium silicate offers growers...

    Potassium Silicate

  • Potassium Sulfate — Water Soluble Potassium Source

    Potassium Sulfate — Water Soluble Potassium Source

    Potassium Sulfate (SOP) — Chloride-Free Water-Soluble Potassium for Hydroponics & Fertigation Potassium...

    Potassium Sulfate — Water Soluble Potassium Source

Water-Soluble Potassium Fertilizers

Potassium is essential for water regulation, enzyme activation, sugar transport, and overall crop quality. Custom Hydro stocks the purest water-soluble potassium sources available for professional fertigation, hydroponic, and foliar programs.

Potassium Sources Available

  • Potassium sulfate (SOP) — chloride-free K with sulfur, available in 0-0-50, 0-0-51, 0-0-52, and 0-0-53 analyses depending on grade and brand
  • Potassium nitrate (KNO3 13-0-46) — chloride-free K with nitrate-N
  • Mono-potassium phosphate (MKP 0-52-34) — K with phosphorus, lowest salt index
  • PeKacid 0-60-20 — acidifying K+P source for high-pH water
  • Potassium chloride (MOP 0-0-61) — high-analysis K for non-sensitive crops
  • Potassium silicate — K with bioavailable silicon

Key Features

  • 100% water-soluble — compatible with all fertigation and hydroponic systems
  • Chloride-free options for sensitive crops and closed-loop systems
  • Near-zero sodium options (Haifa Multi-K RECI) for recirculating hydroponics
  • Multiple K forms for precise nutrient and pH management

Ideal Applications

  • Hydroponic nutrient solutions
  • Fertigation: drip, micro-jet, center pivot, sprinklers
  • Foliar spray programs
  • Soluble NPK blends and liquid fertilizer production
  • 5-31-40 POLYPHOSPHATE FERTILIZER 4 lb.
    5-31-40 POLYPHOSPHATE FERTILIZER 4 lb.
    Sold out
    5-31-40 POLYPHOSPHATE FERTILIZER 4 lb.
    $23.90
    $0.00 $23.90
    Sold out
  • Potassium Sulfate 0-0-53 fertilizer 1 lb.
    SOP 3IX 0-0-53 Crystalline Potassium Sulfate 1 lb
    SOP 3IX 0-0-53 Crystalline Potassium Sulfate 1 lb
    $9.30
    $0.00 $9.30
  • 5-31-40 POLYPHOSPHATE FERTILIZER 20 lb.
    5-31-40 POLYPHOSPHATE FERTILIZER 20 lb.
    Sold out
    5-31-40 POLYPHOSPHATE FERTILIZER 20 lb.
    $68.06
    $0.00 $68.06
    Sold out
  • ICL PeaK MKP 40 lb. MKP Mono-Potassium Phosphate 40 lb
    MKP Mono-Potassium Phosphate 40 lb
    Grower Price
    MKP Mono-Potassium Phosphate 40 lb
    $69.92
    $148.67 $69.92
    Grower Price
  • Sil-MATRIX LC - Soluble Potassium Silicate 2.5 gallon Sil-MATRIX Potassium Silicate specification sheet page 1
    Sil-MATRIX LC Potassium Silicate 2.5 Gallon
    Grower Price
    Sil-MATRIX LC Potassium Silicate 2.5 Gallon
    $93.85
    $130.36 $93.85
    Grower Price
  • PeKacid 0-60-20 fertilizer 1 lb.
    PeKacid 0-60-20 fertilizer 1 lb.
    PeKacid 0-60-20 fertilizer 1 lb.
    $13.00
    $0.00 $13.00
  • Pro Powders Silica Potassium Silicate 50lb Pro Powders Silica Pro Potassium Silicate
    Pro Powders Silica Pro Potassium Silicate
    Grower Price
    Pro Powders Silica Pro Potassium Silicate
    From $17.30
    $24.99 From $17.30
    $17.30 lb
    Grower Price
  • Potassium Nitrate 4 lb
    Potassium Nitrate 4 lb
    Grower Price
    Potassium Nitrate 4 lb
    $15.18
    $30.00 $15.18
    Grower Price
  • Potassium Carbonate 4lb. Step-by-step infographic showing how to make a pH UP stock concentrate using Arm & Hammer DCAD Plus Potassium Carbonate Sesquihydrate. Steps include: wear safety gear, fill with cold water, add powder slowly, stir until clear, use 20-40g per 4 liters, and store sealed and dry. Fertilizer grade 0-0-57, 57% K2O.
    Potassium Carbonate 0-0-57 | 4 lb
    Potassium Carbonate 0-0-57 | 4 lb
    $23.44
    $23.44
  • MagPhos 0-55-18 fertilizer 4 lb.
    MagPhos 0-55-18 fertilizer 4 lb.
    MagPhos 0-55-18 fertilizer 4 lb.
    $22.75
    $0.00 $22.75
  • PeKacid 0-60-20 fertilizer 20 lb.
    PeKacid 0-60-20 fertilizer 20 lb.
    PeKacid 0-60-20 fertilizer 20 lb.
    $66.20
    $0.00 $66.20
  • DKP 0-41-54 fertilizer 20 lb. DKP 0-41-54 fertilizer 20 lb.
    DKP 0-41-54 fertilizer 20 lb.
    DKP 0-41-54 fertilizer 20 lb.
    $89.64
    $0.00 $89.64
  • Potassium Nitrate 1 lb
    Potassium Nitrate 1 lb
    Grower Price
    Potassium Nitrate 1 lb
    $7.32
    $15.00 $7.32
    Grower Price
  • DKP 0-41-54 fertilizer 4 lb. DKP 0-41-54 fertilizer 4 lb.
    DKP 0-41-54 fertilizer 4 lb.
    DKP 0-41-54 fertilizer 4 lb.
    $29.60
    $0.00 $29.60
  • 5-31-40 POLYPHOSPHATE FERTILIZER 1 lb.
    5-31-40 POLYPHOSPHATE FERTILIZER 1 lb.
    5-31-40 POLYPHOSPHATE FERTILIZER 1 lb.
    $13.92
    $0.00 $13.92
  • Potassium Nitrate fertilizer 50 lb. bucket
    Potassium Nitrate 50 lb Bucket
    Potassium Nitrate 50 lb Bucket
    $98.47
    $0.00 $98.47

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