Water Soluble Sulfur

  • SoluGreen 21-0-0 ammonium sulfate water soluble fertilizer 50 lb bag — American Plant Food Corp.

    Ammonium Sulfate

    Ammonium Sulfate

  • Magriculture Magnesium Sulfate 50 lb. bag.

    Magnesium Sulfate Fertilizer

    Water-Soluble Magnesium Sulfate FertilizerMagnesium sulfate (MgSO4) is one of the most versatile...

    Magnesium Sulfate Fertilizer

  • Potassium Magnesium Sulfate KMS UltraFines 4 lb.

    Potassium Magnesium Sulfate — Water Soluble Sulfur Source

    Potassium Magnesium Sulfate (KMS) — Natural Triple-Nutrient Sulfur Source Potassium magnesium sulfate...

    Potassium Magnesium Sulfate — Water Soluble Sulfur Source

  • Haifa SOP GG 0-0-51 55 lb.

    Potassium Sulfate — Water Soluble Sulfur Source

    Potassium Sulfate — Water-Soluble Potassium & Sulfur for Hydroponics & Fertigation Potassium...

    Potassium Sulfate — Water Soluble Sulfur Source

Water-Soluble Sulfur Fertilizers

Sulfur is an essential macronutrient required for protein synthesis, enzyme function, and chlorophyll formation. It is frequently deficient in sandy soils, high-production systems, and programs relying heavily on sulfur-free nitrogen sources. Custom Hydro stocks a full range of water-soluble sulfur sources for professional fertigation, hydroponic, and foliar programs.

Sulfur Sources Available

  • Magnesium sulfate (MgSO4) — S with magnesium; the most widely used sulfur source in fertigation
  • Potassium sulfate (SOP) — S with chloride-free potassium
  • Potassium magnesium sulfate (K-Mag / Sul-Po-Mag) — S with K and Mg in one compound
  • Ammonium sulfate — S with ammonium-N; acidifying nitrogen source
  • Calcium sulfate (gypsum) — S with calcium for soil amendment

Key Features

  • 100% water-soluble — compatible with all fertigation and hydroponic systems
  • Multiple S forms paired with complementary macronutrients
  • Suitable for all crops, growing media, and production systems

Ideal Applications

  • Hydroponic nutrient solutions
  • Fertigation: drip, micro-jet, center pivot, sprinklers
  • Foliar spray programs
  • Soil amendment for S-deficient fields
  • Magriculture Magnesium Sulfate 50 lb. bag. Magriculture Magnesium Sulfate Heptahydrate 50 lb
    Magriculture Magnesium Sulfate Heptahydrate 50 lb
    Grower Price
    Magriculture Magnesium Sulfate Heptahydrate 50 lb
    $26.30
    $41.64 $26.30
    $0.53 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
  • Magnesium Sulfate 4 lb.
    Magnesium Sulfate 4 lb.
    Magnesium Sulfate 4 lb.
    $6.21
    $0.00 $6.21
    $1.55 lb
  • Magnesium Sulfate 20 lb. Custom Hydro Magnesium Sulfate (Epsom Salt) water soluble fertilizer 20 lb pail
    Magnesium Sulfate Heptahydrate (Epsom Salt) - 20 lb
    Magnesium Sulfate Heptahydrate (Epsom Salt) - 20 lb
    $14.50
    $0.00 $14.50
    $0.73 lb
  • Solution Grade GYPSUM 50 lb. ACG Valu-Fil 650 Solution Grade Gypsum 50 lb.
    ACG Valu-Fil 650 Solution Grade Gypsum 50 lb.
    Grower Price
    ACG Valu-Fil 650 Solution Grade Gypsum 50 lb.
    $14.56
    $21.90 $14.56
    $0.29 lb
    Grower Price
  • Solution Grade Gypsum 4 lb ziplock bag — calcium sulfate fertilizer by Custom Hydro Nutrients Calcium Sulfate, Solution Grade GYPSUM 4 lb.
    Solution Grade Gypsum 4 lb. | Calcium Sulfate
    Solution Grade Gypsum 4 lb. | Calcium Sulfate
    $3.50
    $0.00 $3.50
    $0.88 lb
  • 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
  • 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
  • Sulfate of Potash 0-0-51 Greenhouse Grade 4 lb. Sulfate of Potash 0-0-51 GG 4 lb.
    Sulfate of Potash 0-0-51 GG 4 lb.
    Sulfate of Potash 0-0-51 GG 4 lb.
    $13.82
    $0.00 $13.82
    $3.46 lb
  • Magnesium Sulfate 40 lb. A pile of Magriculture magnesium sulfate heptahydrate rhombic crystals.
    Magnesium Sulfate Heptahydrate (Epsom Salt) - 40 lb
    Magnesium Sulfate Heptahydrate (Epsom Salt) - 40 lb
    $28.15
    $0.00 $28.15
    $0.70 lb
  • Solution Grade Gypsum 20 lb brown box — calcium sulfate fertilizer by Custom Hydro Nutrients Calcium Sulfate, Solution Grade GYPSUM 20 lb.
    Solution Grade Gypsum 20 lb. | Calcium Sulfate
    Solution Grade Gypsum 20 lb. | Calcium Sulfate
    $12.47
    $0.00 $12.47
    $0.62 lb
  • SoluGreen 21-0-0 ammonium sulfate water soluble fertilizer 50 lb bag — American Plant Food Corp. SoluGreen ammonium sulfate crystals, 21-0-0 + 24% sulfur fertilizer — lowest heavy metal content
    SoluGreen Ammonium Sulfate 21-0-0 fertilizer 50 lb.
    Grower Price
    SoluGreen Ammonium Sulfate 21-0-0 fertilizer 50 lb.
    $30.27
    $59.62 $30.27
    $0.61 lb
    Grower Price
  • Haifa BitterMAG Epsom Salt Fertilizer for Hydroponics. Haifa BitterMAG 50 lb. bag backside
    Haifa BitterMag Magnesium Sulfate 50 lb
    Grower Price
    Haifa BitterMag Magnesium Sulfate 50 lb
    $23.36
    $45.00 $23.36
    $0.47 lb
    Grower Price
  • Ammonium Sulfate 20 LB Ammonium Sulfate 20 LB
    Ammonium Sulfate 20 LB
    Ammonium Sulfate 20 LB
    $18.75
    $0.00 $18.75

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