You just invested in a brand new gunite pool. The plaster is fresh, the water is going in, and you're already planning that first swim. But here's something most homeowners don't realize: the work isn't done when the pool looks finished.

Your new pool needs to go through the pool startup process. If you skip or rush this process, you risk issues that affect both how your pool looks and how long it lasts.

What is the Pool Startup Process and Why it Matters?

The pool startup process is the first 28–30 days after your pool is filled. During this time, your plaster is actively curing, and your water chemistry must be carefully managed.

This isn’t a one-time step. It’s a daily process of testing, adjusting, brushing, and monitoring.

Done correctly, startup helps your pool surface last 10–15 years. Done poorly, it can lead to early wear, surface damage, and ongoing maintenance issues.

When Does Pool Startup Begin?

Pool startup is dictated by your plaster. Fresh plaster needs water to cure properly. The moment plaster application is complete, filling needs to begin, and it cannot stop until the pool is full.

If filling is interrupted, even briefly, the exposed plaster above the waterline can dry out, crack, and pull away from the gunite shell. It can also leave a permanent "tide line", or visible ring around the pool that's nearly impossible to remove.

How Does the Fill Water Chemistry Affect Your Pool Finish?

Fresh plaster is extremely rich in calcium. Most fill water in Baton Rouge is relatively low in calcium.

When these two come into contact, the water tries to balance itself by pulling calcium out of the plaster. This process is called calcium leaching.

Without proper startup, this reaction begins immediately, and can cause long-term damage before you ever notice a problem.

What Happens if You Skip Proper Pool Startup?

Calcium leaching is often behind the “mystery issues” homeowners see months later.

These can include:

• Rough or uneven surfaces
• Pitting or soft spots
• Premature wear that looks like aging
• Discoloration or staining

These problems don’t happen overnight. They start in the first few weeks.

How Does Proper Pool Startup Protect Your Pool Plaster Finish?

The goal of startup is simple: bring your water into balance before it can damage the surface.

That includes:

• Testing and adjusting calcium hardness, pH, and alkalinity
• Adding a sequestering agent to prevent metal staining
• Maintaining consistent circulation and brushing

Getting this right early protects both the appearance and durability of your pool.

What Is the Step-by-Step Pool Startup Process for a New Gunite Pool?

Here's what the first 28–30 days should look like on a properly managed new pool startup:

• Test fill water immediately for pH, alkalinity, calcium hardness, and metals before anything else is added
• Add a sequestering agent to neutralize iron and metals in the fill water
• Adjust calcium hardness, alkalinity, and pH to bring the water into equilibrium with the plaster surface
• Start the filtration system and run the pump 24 hours a day for the first week
• Brush the pool twice daily to remove plaster dust as the surface cures to protect the finish and keep the filter clean
• Introduce chlorine carefully, only after the water is properly balanced, and in controlled amounts (usually several days after the pool has been filled)
• Monitor and adjust daily for the first 28–30 days as the plaster continues to cure and chemistry stabilizes

Important: Avoid using heaters, salt systems, or automatic cleaners during this period.

Gunite Pool Startup Frequenlty Asked Questions

What's the difference between gunite and plaster? Gunite forms the structural shell of the pool. It's sprayed concrete that gives the pool its shape and strength. Plaster is applied over the cured gunite and serves as the waterproof finished surface. Both require proper curing.

Why can't filling be stopped once it starts? Fresh plaster needs continuous moisture as it cures. If filling stops, the exposed plaster can cure unevenly, which can cause cracking and permanent discoloration.

How does fill water chemistry affect my plaster? Fresh plaster is calcium-rich. Most fill water is calcium-poor. Without proper chemical adjustment, the water draws calcium out of the plaster surface, causing pitting, roughness, and long-term finish damage.

How long does new pool startup take? The most critical window is the first 28–30 days. That's when the plaster is actively curing and water chemistry must be closely managed.

Why Choosing the Right Pool Builder Matters for Startup and Longevity

Proper startup takes more than just filling a pool and turning on the pump. It requires careful attention, experience, and ongoing adjustments during the most critical phase of your pool’s life.

Working with a custom pool builder who prioritizes the startup process means you’re not just investing in how your pool looks; you’re investing in how it performs for years to come.

A properly managed startup creates a stable foundation for your pool’s finish, ensuring water chemistry is balanced and the surface cures the way it should. That early attention to detail is what prevents long-term issues and protects the integrity of your pool.

At Lucas Firmin Pools, we treat startup as part of the building process, not an afterthought. If you’re planning a new pool in Baton Rouge or the surrounding areas, reach out to our experienced team to guide you through the pool-building process and ensure your pool is built, started, and maintained the right way from day one.