How should I choose Humboldt County's Own Magnum?

Humboldt County's Own Magnum should be matched to your growing media, water source, crop stage, feeding style, and pH/EC monitoring plan. Choose the exact size or variant before adding to cart. This page has 4 purchasable options, and price, stock, weight, and dimensions can change by size.

Can Humboldt County's Own Magnum ship in the United States?

Toledo Indoor Garden ships eligible products within the United States. Available shipping options, rates, and estimated delivery timing are calculated during checkout from the selected cart and destination address.

What sizes does Humboldt County's Own Magnum come in?

Humboldt County's Own Magnum is available in 4 options: 32oz, 1gal, 2.5gal, 5gal. Select your preferred size on the product page to see pricing and availability.

What is the return policy for Humboldt County's Own products?

Toledo Indoor Garden accepts free 30-day parcel returns on unused, unopened Humboldt County's Own products in original packaging after return authorization. Freight, LTL, oversized, special-order, or commercial items may require customer-paid return freight unless the item arrived damaged or defective.

Humboldt County's Own Magnum

SKU: ETMAG-32OZ

Size: 32oz

$15.99

Available to Order

Inventory may be in-store or supplier warehouse. Call 419-725-2450 to confirm availability, handling timing, or shipping.

Questions? Call 419-725-2450

Quick answer

Humboldt County's Own Magnum should be matched to your growing media, water source, crop stage, feeding style, and pH/EC monitoring plan.

Best fitGrowers building a nutrient program around a specific media type, water source, and crop stage.

Check before orderingChoose the exact size or variant before adding to cart. This page has 4 purchasable options, and price, stock, weight, and dimensions can change by size.

Grower tipStart from the label or feed chart, measure pH and EC, and increase strength only after plants show they are handling it.

Shopping guidance from Toledo Indoor Garden. Prices, availability, shipping rates, weights, and dimensions are verified during checkout.

Humboldt County's Own Magnum is a premium calcium and magnesium supplement that supplies readily available calcium and magnesium to fast-growing plants, along with iron and other essential trace elements.

It supports strong cell walls, nutrient transport, and chlorophyll production, and is useful when using reverse osmosis water or coco coir.

Use at 2-5 ml per gallon throughout the grow cycle.

Derived from calcium chloride, magnesium sulfate, and iron EDTA.

This is the 32oz size; also available in 1gal, 2.5gal, and 5gal.