General Hydroponics Armor Si is a new hydroponic supplement offered in several sizes, including 1 quart, 1 gallon, 2.5 gallons, and 5 gallons. Free shipping is included, which may help when comparing total cost across size options. With multiple container sizes available, this listing may suit small home growers testing a product as well as buyers who need a larger supply for ongoing hydroponic use. The range of sizes can also be useful if you are trying to match your purchase to your grow setup and usage rate. This page is most helpful for shoppers specifically looking for the Armor Si model from General Hydroponics. Check the listing for full details. General Hydroponics Armor Si 1 QT, 1 Gal , 2.5 Gal , 5 Gal. Condition: New. Listed at 254.49 USD. ✅ Key Benefits: 🛡️ Stronger Plant Structure – Reinforces cell walls for sturdier stems and better support. ☀️ Better Light Absorption – Supports faster, healthier growth with improved photosynthetic performance.