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
  • ICL PeaK MKP 0-52-34 fertilizer 50 lb. BAG ICL PeaK MKP 0-52-34 fertilizer 50 lb. BAG BACKSIDE
    ICL PeaK MKP 0-52-34 Fertilizer 50 lb
    Sold out
    ICL PeaK MKP 0-52-34 Fertilizer 50 lb
    $75.67
    $110.00 $75.67
    $1.51 lb
    Sold out
  • AgSil 16H Potassium Silicate fertilizer 50 lb. AgSil 16h soluble potassium silicate
    AgSil 16H Potassium Silicate 50 lb
    Sold out
    AgSil 16H Potassium Silicate 50 lb
    $337.16
    $507.00 $337.16
    $6.74 lb
    Sold out
  • ICL PeaK MKP 4 lb. MKP Mono-Potassium Phosphate 4 lb
    MKP Mono-Potassium Phosphate 4 lb
    Grower Price
    MKP Mono-Potassium Phosphate 4 lb
    $18.66
    $37.00 $18.66
    $4.67 lb
    Grower Price
  • Haifa MKP 0-52-34 Fertilizer 50 lb. Haifa MKP 0-52-34 Fertilizer 55 lb
    Haifa MKP 0-52-34 Fertilizer 55 lb
    Grower Price
    Haifa MKP 0-52-34 Fertilizer 55 lb
    $74.73
    $99.00 $74.73
    $1.36 lb
    Grower Price
  • Haifa SOP GG 0-0-51 55 lb. Haifa SOP GG 0-0-51 55 lb.
    Haifa SOP GG 0-0-51 55 lb.
    Grower Price
    Haifa SOP GG 0-0-51 55 lb.
    $41.75
    $60.00 $41.75
    $0.76 lb
    Grower Price
  • Protassium+ 3IX 0-0-53 fertilizer 50 lb. Pile of white SOP 3IX 0-0-53 fertilizer powder on a white background
    Protassium+ SOP 3IX 0-0-53 Potassium Sulfate 50 lb
    Grower Price
    Protassium+ SOP 3IX 0-0-53 Potassium Sulfate 50 lb
    $60.98
    $91.70 $60.98
    $1.22 lb
    Grower Price
  • ICL PeaK MKP 1 lb. MKP Mono-Potassium Phosphate 1 lb
    MKP Mono-Potassium Phosphate 1 lb
    Grower Price
    MKP Mono-Potassium Phosphate 1 lb
    $8.48
    $16.96 $8.48
    $8.48 lb
    Grower Price
  • Potassium Sulfate 0-0-53 fertilizer 4 lb.
    SOP 3IX 0-0-53 Crystalline Potassium Sulfate 4 lb
    SOP 3IX 0-0-53 Crystalline Potassium Sulfate 4 lb
    $13.25
    $0.00 $13.25
    $3.31 lb
  • Potassium Sulfate 0-0-53 fertilizer 20 lb.
    SOP 3IX 0-0-53 Crystalline Potassium Sulfate 20 lb
    SOP 3IX 0-0-53 Crystalline Potassium Sulfate 20 lb
    $33.94
    $0.00 $33.94
    $1.70 lb
  • Potassium Carbonate 50lb.
    DCAD Plus Potassium Carbonate 0-0-57 | 50 lb
    Grower Price
    DCAD Plus Potassium Carbonate 0-0-57 | 50 lb
    $96.43
    $120.35 $96.43
    $1.93 lb
    Grower Price
  • ICL PeaK MKP 20 lb. MKP Mono-Potassium Phosphate 20 lb
    MKP Mono-Potassium Phosphate 20 lb
    Grower Price
    MKP Mono-Potassium Phosphate 20 lb
    $47.28
    $94.56 $47.28
    $2.36 lb
    Grower Price
  • Organic SOP 0-0-50 STANDARD FINES 50lb. Protassium organic standard fines logo
    Protassium+ Organic SOP 0-0-50 Standard Fines | 50...
    Grower Price
    Protassium+ Organic SOP 0-0-50 Standard Fines | 50...
    $65.60
    $98.66 $65.60
    $1.31 lb
    Grower Price
  • Potassium Nitrate 20 lb.
    Potassium Nitrate 20 lb
    Grower Price
    Potassium Nitrate 20 lb
    $41.78
    $83.00 $41.78
    $2.09 lb
    Grower Price
  • PeKacid 0-60-20 fertilizer 4 lb.
    PeKacid 0-60-20 fertilizer 4 lb.
    PeKacid 0-60-20 fertilizer 4 lb.
    $22.00
    $0.00 $22.00
    $5.50 lb
  • Haifa GrowClean 5-31-40 polyphosphate fertilizer 55 lb. Haifa GrowClean fertilizer 55 lb. bag-BACK
    Haifa GrowClean 5-31-40 polyphosphate fertilizer 55 lb.
    Sold out
    Haifa GrowClean 5-31-40 polyphosphate fertilizer 55 lb.
    $129.05
    $161.00 $129.05
    Sold out
  • PeKacid 0-60-20 Fertilizer 55 lb. PeKacid 0-60-20 Fertilizer 55 lb. backside
    PeKacid 0-60-20 Fertilizer 55 lb.
    Grower Price
    PeKacid 0-60-20 Fertilizer 55 lb.
    $121.35
    $161.50 $121.35
    Grower Price

Serving Arkansas, Kansas, Missouri and Oklahoma. Shipping Nationwide! Wholesale to the public!