Pool Startup After Plaster: The First 28 Days, Day by Day

Start-up is what happens between the day a pool is refinished and the day it settles into normal care. Pebble Technology International, a maker of pebble finishes, says start-up “will have the most influence on the final appearance and longevity of your interior finish”, and that “during the first twenty eight (28) days, the product develops most of its durability characteristics”, A start-up card marked “NPC Recommended” (NPC is the National Plasters Council), published by Wet Edge, another maker, says the finish “is especially susceptible to staining, scaling, and discoloration within the first 28 days.”

The two guides quoted here agree on the shape of start-up and differ on some figures, so both are given. The card for the finish in your pool, from whoever applied it, is the one to follow.

Who does what

Pebble Technology International describes a “break-in” period of “approximately 1-3 days” in which the builder or applicator finishes the surface before handing it over “to you for start-up and ongoing maintenance”, and says the applicator “should communicate with you once this has been completed.” Ask, before the work starts, which steps the applicator will do and which are yours.

Filling the pool

Both guides want the pool filled in one go:

• Pebble Technology International: fill “without interruption with clean, potable water to the midway point on the tile line or the midway point on the face of the skimmer”, and “Do not stop water flow for any reason as it will cause a ‘waterline mark’ in the finish.”
• The NPC-marked card: fill “without interruption as rapidly as possible with clean potable water to help prevent a bowl ring, and to decrease shrinkage cracking”, with a clean cloth on the end of the hose in the deepest part of the pool.
• Pebble Technology International adds: “Do not fill the pool with soft water”, and “Do not enter the pool until it is completely filled with water (including pets).”

Test the fill water first. Pebble Technology International recommends testing the source water before filling and sharing the result “so that necessary chemical adjustments can be made”, and the NPC-marked card says to test it “for pH, total alkalinity (TA), calcium hardness (CH) and metals.” In Lee County the published figures differ by utility: Cape Coral’s 2025 water quality report gives 5.5 to 6.5 grains per gallon of total hardness, and the City of Fort Myers’ report gives none, so a test is the only way to know what is going into your pool.

The first week

	NPC-marked card	Pebble Technology International
Pump and filter	Running continuously “for seven days, or until the plaster dust has been brushed away and filtered out, and the water is no longer cloudy (minimum of 72 hours)”	Circulating continuously “for a minimum of five (5) days, or until all white material (plaster dust) has been removed”, whichever is longer
Brushing	“Brush the entire pool surface thoroughly at least twice daily to remove all plaster dust”	The same, in its checklist
Chlorine	“DO NOT add chlorine for 48 hours”; chlorine added on day 3	“DO NOT add chlorine for 48 hours” (checklist)
Pool cleaners	No wheeled vacuums or wheeled cleaners until after 28 days	The same, in its checklist

Pebble Technology International explains why the brushing matters: “It is natural for some white material (plaster dust) to release from the new surface”, and failing to keep the water in range “will result in white plaster dust adhering to the finish surface causing stains, blotchy discoloration and/or roughness.”

Water chemistry during start-up

Both guides give day-by-day steps for bringing total alkalinity, pH and calcium hardness into range, in a set order, and both say to follow the steps “in the recommended order”. Their target ranges are not the same: Pebble Technology International’s start-up range for the first 28 days is pH 7.0 to 7.4, total alkalinity 80 to 100 ppm and calcium hardness 150 to 250 ppm, and it notes the range is “designed for high-performance finishes and not recommended for traditional pool plaster”. The NPC-marked card raises calcium hardness in steps, to a minimum of 200 ppm from day 4. That difference is a reason to use the card for your finish rather than either list here.

If you handle the chemicals yourself, the card’s rule comes first: “ALWAYS ADD A CHEMICAL TO WATER, NEVER WATER TO THE CHEMICAL.”

SGM, a Florida plaster maker, connects start-up chemistry to mottling. Its bulletin on mottling, which it describes as “blotchy Gray or black areas on the surface of the pool”, lists “Unbalanced water during start-up” and “High PH & Total Alkalinity during the Hydration process (28 days)” among the possible causes.

Salt, heat and swimming

• Salt. The NPC-marked card: “do not add salt within the first 30 days”. Pebble Technology International: no salt “for the first twenty-eight (28) days” in its start-up text and on its care page, and 30 days in its own checklist.
• Heat. The NPC-marked card: do not turn on the heater until the water is balanced and no plaster dust remains. Pebble Technology International: “wait at least 14 days before heating the water”.
• Swimming. The NPC-marked card: “It is not recommended to swim in the pool until the water is properly balanced and sanitized.”

After the first month

After 28 days, Pebble Technology International moves owners to its ongoing maintenance ranges and to the Langelier Saturation Index, a formula that “takes into account pH, carbonate alkalinity, water temperature, total dissolved solids, and calcium hardness.” The NPC-marked card says that from day 7 to day 28, once the dust is gone and a good cleaning system is in place, brushing can be limited to visible debris or to when chemicals are added.

If you are planning a new finish rather than starting one up, pool resurfacing covers the job from draining to refilling, and marcite, quartz and pebble compared covers the choice of finish.