Flairform pH 4 (250ml / 1L)

What is Flairform pH 4 and why is it used?

Flairform pH 4 is a pH 4.0 buffer solution used to calibrate pH meters at the acidic end of the scale. It helps ensure accurate readings in the 4–7 pH range, which is where most hydroponic and coco nutrient solutions sit.

Do I need Flairform pH 4 if I already use pH 7?

Yes. A two-point calibration using both pH 7 and pH 4 gives better accuracy than calibrating with just one. Always calibrate with pH 7 first, then pH 4, to cover the range used in nutrient monitoring.

Is Flairform pH 4 compatible with my pH meter?

Yes—Flairform pH 4 works with most digital pH pens, monitors, and controllers, including those used in hydro, soil, aquaponics, and living systems. It’s a universal standard for meters that support calibration.

How do I use Flairform pH 4 for calibration?

Rinse the probe, pour a small amount into a clean cup, insert the probe, gently swirl, and wait until the reading stabilizes around 4.0. Never dip directly into the bottle, and discard used solution after each use.

Why won’t my meter calibrate in Flairform pH 4?

This could be due to old or contaminated buffer, a dirty or dried-out probe, low battery, or skipping pH 7 in two-point calibration. Clean the probe and use fresh buffer to troubleshoot accuracy issues.

How often should I calibrate with Flairform pH 4?

Monthly is a good minimum. If you check pH daily or run multiple systems, calibrate more frequently or do quick buffer checks to catch drift before it causes nutrient problems.

Does temperature affect calibration with Flairform pH 4?

Yes. Temperature can impact both buffer and meter readings. Let the buffer reach room temperature before use, even with ATC meters, to ensure more stable calibration.

Can I reuse Flairform pH 4 or pour it back into the bottle?

No. Reusing buffer or pouring it back contaminates the solution and ruins accuracy. Always use a fresh, clean portion for each calibration, and discard it after use.

How should I store Flairform pH 4?

Store it tightly sealed, out of direct sunlight, and away from heat or contaminants. Avoid contact with dirty probes or cups. It's stabilised to resist biological growth, but clean handling is essential.

What size Flairform pH 4 should I buy?

250 mL suits hobby growers and occasional use. 1 L is better for frequent calibration, commercial setups, or anyone using multiple meters regularly.

Is Flairform pH 4 safe to handle?

Yes, it’s not highly corrosive, but avoid ingestion or eye contact. Wash hands after use and keep it away from children and pets.