You pay thousands for a smooth new pool, and then the surface feels rough, shows white patches or turns blotchy in the first few months. It is a common worry. This guide explains the start-up period that new plaster needs, what the usual problems are, and which questions to ask a provider before the pool is filled.
Why the first weeks matter
New plaster is a cement-based coating. After it goes on and the pool is filled, it keeps curing and gives off chemicals into the water. The first weeks decide how the surface looks and feels for years. The National Plasterers Council, an industry group, publishes a start-up procedure that runs 28 days after fill. An outline of it from a pool software company shows what each stage involves.
- Fill day. Start the equipment in the right order and keep the fill continuous. One plaster problems guide says to keep filling without a stop during the first fill to prevent staining.
- Day 1 and day 2. Test and adjust pH, alkalinity and calcium, then retest.
- Day 3. Chlorine is introduced, with different notes for saltwater systems.
- Days 4 to 7. Calcium targets are set.
- Days 7 to 28. Brushing moves from a set schedule to an observation-based one once the plaster dust is gone.
Exact numbers for each step come from the plaster maker or your provider, since fill water can change them. The council describes its guidance as advisory and says fill water conditions may require changes.
What a provider typically tells you to do
Different sources give different specifics, so ask your provider for the list in writing. A pool problems guide we read says to brush the walls gently with a nylon brush twice daily for the first two weeks, to run the filter for 72 hours straight, and to avoid shocking the pool in the first month. It also says to wait about 28 days before using automatic cleaners, heaters or saltwater generators, because plaster dust can clog them and heat or salt can damage new plaster. Treat that as one source's list and not as a rule. Your provider and the plaster maker may say something different, and theirs should win.
Plaster also keeps curing for months. The same guide says it takes about 14 to 28 days to be ready for general use and up to about 10 months to cure fully.
Why rough spots and scale appear
Pool sources group the common problems like this.
- Scale. Calcium comes out of the water and sticks to the plaster as a rough, raised crust. It happens when water is out of balance, which is one reason providers watch pH and calcium so closely in the first weeks.
- Etching. The opposite problem. Low pH or low alkalinity makes water that slowly eats the surface.
- Mottling and streaking. Blotchy or streaky color. Causes listed include troweling problems, uneven application, and water chemistry during curing. One guide says mottling is mainly cosmetic and does not affect how long the plaster lasts.
- Spalling and crazing. Flaking or fine spider-web cracks. These point to problems in the mix or the troweling and should be shown to the provider promptly.
- Algae. New plaster is vulnerable if it is not brushed enough in the first two weeks.
It can be hard to tell scale from a trowel defect by eye. A provider can test a spot to see which it is, and the answer changes the fix.
What not to do
The tempting fix for rough plaster is acid. Acid washing can remove scale, but it uses strong acid, and done wrong it can damage the surface. Pool sources say never to use it undiluted and to wear safety gear, so leave it to a professional. If a surface problem shows up, call the provider who did the work first. Fixes range from adjusting the water balance, to sanding, to patching, to an acid treatment done by a professional. Which one is right depends on the cause.
Odessa angle: fill water and heat
Odessa is hot and sunny for much of the year, and warm water and strong sun speed up chlorine loss and swings in water chemistry. Our lifespan guide goes into the sun side.
On the water side, the 2024 City of Odessa water quality report says the city buys all its water untreated from the Colorado River Municipal Water District. The majority is surface water from Lake Ivie, Lake Thomas and Lake Spence, and the city may also draw on wells in Ward and Martin Counties when demand requires. The report lists chloramines as the disinfectant, with an annual average near 3.45 ppm. It does not list water hardness, and the vendor pages that claim hardness figures for Odessa disagree with each other, so we do not quote them. The practical point is simple. Fill water can be different from one fill to the next, and the start-up plan has to be based on a test of the water in your pool, not a generic number.
Ask each provider these questions.
- Do you test my fill water before the pool is filled, and what do you adjust?
- Who is responsible for the start-up, you or me, and for how long?
- What chemicals will you bring, and what do I buy?
- What does the warranty say about rough surfaces, scale, mottling and staining?
- If something goes wrong in the first 28 days, who do I call?
Chemical safety
Start-up means handling acid, chlorine and other chemicals, so follow CDC guidance. Keep chemicals in their original labeled containers, dry and cool, below 95 degrees Fahrenheit. Store each product separately and never mix different chemicals. Use the protective gear on the label, keep them locked away from children and animals, and ventilate the area. If you are not sure, ask your provider to handle it.
Request a quote
If your pool is due for resurfacing, ask for a quote and mention how you want the start-up handled. Request one through this site, and an independent local provider in the Odessa area can look at the pool and answer these questions. It is free and there is no obligation to hire anyone.
Common questions
Why is my new plaster rough?
Common causes include scale from out-of-balance water, etching from low pH or alkalinity, and problems in how the plaster was mixed or troweled. A provider has to look at it to tell which one it is.
Can I swim right away after resurfacing?
Follow the provider's start-up instructions. The National Plasterers Council start-up process runs 28 days, and pool sources say swimming waits until the water is balanced and sanitizer is at the right level.
Should I acid wash rough plaster myself?
No. Acid washing can remove scale, but it uses strong acid, and done wrong it can damage the surface. Pool sources say never to use it undiluted and to wear safety gear, so leave it to a professional.
Does hard water make this worse?
High calcium in the water can raise scaling risk, but the City of Odessa report does not list hardness, so the water balance has to be tested for your pool.