Professors Nutrients Ultra Flush (1L / 5L)

What is Professor’s Nutrients Ultra Flush and what does it do?

It’s a flushing solution designed to dissolve and remove built-up salts in the root zone, helping restore nutrient uptake, correct lockout, and support a cleaner, smoother harvest. It's not a nutrient or booster—think of it as a reset for your medium or system.

When should I use Professor’s Nutrients Ultra Flush?

Use it when you suspect salt build-up, see signs of lockout, after nutrient burn, or during late flower as a finishing step. It can be used in veg or flower, but shouldn’t be overused—flush strategically, not constantly.

Is Professor’s Nutrients Ultra Flush safe for all systems and grow media?

Yes, it's suitable for coco, soil, hydro, DWC, RDWC, and Autopots when used correctly. It can also be used on houseplants. In living soil, use sparingly as a rescue tool, not as a routine additive.

How do I use Professor’s Nutrients Ultra Flush to fix nutrient lockout?

Mix 30ml per 10L of water, apply to the medium, and wait 48 hours before resuming feeding at half strength. If the plant responds well, return to full feeding the following week.

How do I use Ultra Flush before harvest?

Mix 3ml per 1L and apply daily during the final week before harvest. Some growers follow with plain water for a cleaner finish, while others use Ultra Flush to replace longer water-only flushes.

What is the standard dosage and mixing method?

Use 3ml per 1L for maintenance or finishing. Add to water first, stir well, then add any other additives if needed. Always pH your mix last to match your medium (soil, coco, or hydro).

Can I mix Ultra Flush with nutrients or other additives?

Yes, but keep it simple when correcting issues or finishing. Avoid stacking unnecessary additives—especially ones high in salts—while trying to clean the root zone.

Will Ultra Flush clog my irrigation system or drippers?

It’s designed to help prevent salt-related residue buildup. When mixed properly, it won’t clog systems. Most clogging issues come from undissolved powders or poor reservoir hygiene.

Is Ultra Flush safe for beneficial microbes and organic inputs?

It's not a sterilizer, but heavy flushing can disrupt microbe populations. Re-inoculate after use if you run a microbe-heavy setup. It’s aimed at mineral salt buildup, not biofilm from organics.

Do I need runoff when using Ultra Flush in coco or soil?

Yes—runoff is key to removing salts. Aim for 10–20% runoff. If EC remains high, you may need a deeper flush and better feeding/runoff habits going forward.

Should I measure EC/PPM during and after using Ultra Flush?

Absolutely. Monitoring runoff EC gives you insight into how well the flush worked and helps avoid overfeeding or underfeeding afterward. Don’t rely on guesswork late in the grow.

Is Professor’s Nutrients Ultra Flush beginner-friendly?

Yes. It’s easy to use and helps prevent common problems caused by salt buildup. Just don’t overuse it—flush with purpose, and fix the habits that caused the issue in the first place.

What size should I buy: 1L or 5L?

1L is ideal for smaller grows or occasional use. 5L is more cost-effective if you run larger systems, multiple cycles, or want to incorporate regular maintenance flushes.

How should I store Ultra Flush, and is it safe to handle?

Store sealed in a cool, dry place out of direct light. It has a mild nutrient smell. Gloves and PPE aren’t required but are smart—avoid splashes, wash hands after use, and keep out of reach of kids and pets.