Grotek Final Flush, 1 L

Eliminating Excess Salts Before Harvest, 1 L

Fertilizer salts accumulate in growing media over a feeding cycle whether or not a grower notices it, and a media or reservoir that's carrying too much residual salt going into harvest can hold back the finishing stage. Grotek Final Flush is built to eliminate that excess fertilizer salt, helping correct overfeeding before harvest.

This 1 liter size is also effective for desalinizing reusable growing media between crop cycles, extending the useful life of a substrate a grower plans to reuse for a following crop.

Key Features & Benefits

• Eliminates excess salts — clears built-up fertilizer residue before harvest
• Corrects overfeeding — helps recover plants that received too much nutrient
• Desalinizes reusable media — extends the useful life of substrate between cycles
• Used in final growth stages — timed for pre-harvest flushing

Who Should Use Final Flush

Growers preparing for harvest who want to clear residual salts, as well as anyone reusing growing media between crop cycles, will benefit from Final Flush's targeted flushing action.

About Grotek

Grotek products come from Greenstar Plant Products, a Canadian manufacturer that has operated as a Hydrofarm subsidiary since 2021 and also markets the Gaia Green brand.

Frequently Asked Questions

When in the grow cycle should I use Final Flush?

It's intended for the final stages of growth, shortly before harvest, once feeding is otherwise complete. Using it earlier in the cycle would flush nutrients plants still need.

Can Final Flush correct overfeeding mistakes?

Yes, it's formulated to help correct overfeeding by clearing excess salts that have built up in the growing media. That makes it useful as a recovery step, not just a routine pre-harvest treatment.

How do I reuse growing media after flushing?

Run Final Flush through the media at label rates, let it drain fully, and allow the substrate to dry before storing or reusing it for a following crop cycle. Desalinizing this way extends how many cycles a reusable substrate can support.

Does it affect harvest quality?

It's designed to remove excess salt buildup from the growing media, which many growers use as part of finishing a crop cleanly. It doesn't add any nutrient of its own — its role is strictly to flush out what's already accumulated.