Water Soluble Potassium

Extremely pure water soluble potassium fertilizers for fertigation, foliar and hydroponics!

Custom Hydro specializes in stocking the purest most soluble fertilizer materials available anywhere. We have Haifa SOP 0-0-52 greenhouse grade sulfate of potash. Protassium 3 IX the purest potassium sulfate on the market. We also stock Haifa RECI potassium nitrate, the only potassium nitrate to guarantee an ultra-LOW maximum sodium content. This potassium nitrate is perfect for closed loop hydroponic systems. Our wide selection also includes MKP 0-52-34, PeKacid 0-60-20, MagPhos 0-55-18, Potassium Chloride 0-0-61 and Potassium Silicate fertilizers.

Featured Products

Sil-MATRIX LC - Soluble Potassium Silicate 2.5 gallon

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Sil-MATRIX LC - Soluble Potassium Silicate 2.5 gallon

$93.85

In Stock.

Haifa MKP 0-52-34 Fertilizer 55 lb.

(1)

Haifa MKP 0-52-34 Fertilizer 55 lb.

$79.35

In Stock.

AgSil 21, 55 gallon potassium silicate fertilizer

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AgSil 21, 55 gallon potassium silicate fertilizer

$2,141.55

*Special Order Item(2 week lead time)

AgSil 25, 55 gallon potassium silicate fertilizer

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AgSil 25, 55 gallon potassium silicate fertilizer

$1,591.00

-In Stock, Ready to Ship!

SoluPotasse® 55 lb. bag

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SoluPotasse® 55 lb. bag

~~$89.75~~ $75.00 Sale

In Stock.

AgSil 16H Potassium Silicate fertilizer 50 lb.

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AgSil 16H Potassium Silicate fertilizer 50 lb.

$327.18

Get notified when back in stock.

AgSil 16H Potassium Silicate fertilizer - full pallet 40 x 50 lb.

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AgSil 16H Potassium Silicate fertilizer - full pallet 40 x 50 lb.

$12,432.80

Special Order Item, contact us for a quote.

PeKacid 0-60-20 fertilizer 1 lb.

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PeKacid 0-60-20 fertilizer 1 lb.

$13.00

In Stock.

PeKacid 0-60-20 fertilizer 4 lb.

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PeKacid 0-60-20 fertilizer 4 lb.

$22.00

In Stock.

PeKacid 0-60-20 fertilizer 20 lb.

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PeKacid 0-60-20 fertilizer 20 lb.

$66.20

In Stock.

PeKacid 0-60-20 Fertilizer 55 lb.

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PeKacid 0-60-20 Fertilizer 55 lb.

$121.35

Temporary Back Order

Organic SOP 0-0-50 STANDARD FINES 50lb.

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Organic SOP 0-0-50 STANDARD FINES 50lb.

$65.60

In Stock.

ICL PeaK MKP 1 lb.

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ICL PeaK MKP 1 lb.

$12.79

In Stock.

ICL PeaK MKP 20 lb.

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ICL PeaK MKP 20 lb.

$82.74

In Stock.

ICL PeaK MKP 4 lb.

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ICL PeaK MKP 4 lb.

$25.78

In Stock.

ICL PeaK MKP 40 lb.

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ICL PeaK MKP 40 lb.

$127.78

In Stock.

ICL PeaK MKP 0-52-34 fertilizer 50 lb.

(1)

ICL PeaK MKP 0-52-34 fertilizer 50 lb.

$74.28

In Stock.

Potassium Nitrate 1 lb.

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Potassium Nitrate 1 lb.

$8.50

In Stock.

Potassium Nitrate 20 lb.

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Potassium Nitrate 20 lb.

$36.60

In Stock.

Potassium Nitrate 4 lb.

(1)

Potassium Nitrate 4 lb.

$15.00

In Stock.

UltraSol K Plus Potassium Nitrate 50 lb.

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UltraSol K Plus Potassium Nitrate 50 lb.

$68.77

Out of Stock.

Potassium Nitrate fertilizer 50 lb. bucket

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Potassium Nitrate fertilizer 50 lb. bucket

$91.59

In Stock.

ICL MagPhos 0-55-18 fertilizer 55 lb.

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ICL MagPhos 0-55-18 fertilizer 55 lb.

$114.00

Out Of Stock

MagPhos 0-55-18 fertilizer 1 lb.

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MagPhos 0-55-18 fertilizer 1 lb.

$13.50

In Stock.

MagPhos 0-55-18 fertilizer 4 lb.

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MagPhos 0-55-18 fertilizer 4 lb.

$22.75

In Stock.

MagPhos 0-55-18 fertilizer 20 lb.

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MagPhos 0-55-18 fertilizer 20 lb.

$67.00

In Stock.

Haifa GrowClean 5-31-40 polyphosphate fertilizer 55 lb.

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Haifa GrowClean 5-31-40 polyphosphate fertilizer 55 lb.

$129.05

In Stock.

5-31-40 POLYPHOSPHATE FERTILIZER 1 lb.

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5-31-40 POLYPHOSPHATE FERTILIZER 1 lb.

$13.92

In Stock.

5-31-40 POLYPHOSPHATE FERTILIZER 4 lb.

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5-31-40 POLYPHOSPHATE FERTILIZER 4 lb.

$23.90

In Stock.

5-31-40 POLYPHOSPHATE FERTILIZER 20 lb.

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5-31-40 POLYPHOSPHATE FERTILIZER 20 lb.

$68.06

In Stock.

Haifa SOP GG 0-0-51 55 lb.

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Haifa SOP GG 0-0-51 55 lb.

$47.32

In Stock.

Protassium+ SOP 3IX 0-0-53 fertilizer 50 lb.

(1)

Protassium+ SOP 3IX 0-0-53 fertilizer 50 lb.

$60.98

In Stock.

Haifa DKP 0-40-53 fertilizer 50 lb.

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Haifa DKP 0-40-53 fertilizer 50 lb.

$179.55

In Stock.

DKP 0-41-54 fertilizer 1 lb.

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DKP 0-41-54 fertilizer 1 lb.

$15.08

In Stock.

DKP 0-41-54 fertilizer 4 lb.

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DKP 0-41-54 fertilizer 4 lb.

$29.60

In Stock.

DKP 0-41-54 fertilizer 20 lb.

(1)

DKP 0-41-54 fertilizer 20 lb.

$89.64

In Stock.

Potassium Sulfate 0-0-53 fertilizer 1 lb.

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Potassium Sulfate 0-0-53 fertilizer 1 lb.

$9.30

In Stock.

Potassium Sulfate 0-0-53 fertilizer 4 lb.

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Potassium Sulfate 0-0-53 fertilizer 4 lb.

$13.25

In Stock.

Potassium Sulfate 0-0-53 fertilizer 20 lb.

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Potassium Sulfate 0-0-53 fertilizer 20 lb.

$33.94

In Stock.

Agrihusta ORGANIC 3-0-9 Potassium-Nitrate fertilizer (5 GAL)

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Agrihusta ORGANIC 3-0-9 Potassium-Nitrate fertilizer (5 GAL)

~~$90.75~~ $75.00 Sale

In Stock.

Potassium Carbonate 50lb.

(1)

Potassium Carbonate 50lb.

$96.43

In Stock.

Potassium Carbonate 20lb.

(0)

Potassium Carbonate 20lb.

$77.10

In Stock.

Potassium Carbonate 4lb.

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Potassium Carbonate 4lb.

$23.44

In Stock.

Potassium Carbonate 1lb.

(0)

Potassium Carbonate 1lb.

$10.85

In Stock.

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