---
title: "What Is Drop test kit? Pool Glossary | Marina Pool Services"
description: "A drop test kit uses liquid reagents, such as FAS-DPD, to give more exact water readings than strips."
url: https://marinapool.multisites.ai/glossary/drop-test-kit
publisher: Marina Pool Services
phone: +1-817-896-1120
quote: https://marinapool.multisites.ai/contact
---

Water chemistry

# Drop test kit

A drop test kit uses liquid reagents, such as FAS-DPD, to give more exact water readings than strips.

A drop kit takes more time than strips, but you can trust the numbers more. You add reagent drops to a water sample and count until the color changes.

It is the best home tool for telling [free chlorine](https://marinapool.multisites.ai/glossary/free-chlorine) from [combined chlorine](https://marinapool.multisites.ai/glossary/combined-chlorine), and it reads high chlorine levels that strips cannot. Replace the reagents every year, since they go bad. Store the kit out of the sun and rinse the vials after every test. Keep a log so you see trends.

[Marina can helpPool Maintenance Services](https://marinapool.multisites.ai/our-services/pool-maintenance-services)

## Related terms

-   [Test strips](https://marinapool.multisites.ai/glossary/test-strips)
-   [Lab water test](https://marinapool.multisites.ai/glossary/lab-water-test)
-   [Free chlorine](https://marinapool.multisites.ai/glossary/free-chlorine)
-   [Combined chlorine](https://marinapool.multisites.ai/glossary/combined-chlorine)

## Need a hand with your pool?

Call or text and tell us what your pool needs. Estimates are free for qualifying services, and same-day estimates are possible when the schedule allows.

[Call (817) 896-1120](tel:+1-817-896-1120)[Get a quote](https://marinapool.multisites.ai/contact)

![A pool technician working on an equipment pad](https://marinapool.multisites.ai/_astro/technician-equipment-pad.BW5xZMNY_Zum1K5.webp)