How a Spa Parts Retailer Increased ROAS 27% On Google Without More Spend

This ecommerce retailer specializes in spa and hot tub replacement parts, including pumps, filters, heaters, lighting systems, and accessories across a catalog of thousands of SKUs.

The business serves primarily residential customers, along with a smaller segment of commercial buyers who rely on consistent access to replacement components. With highly intent-driven demand and a broad product assortment, performance depends on strong product data and precise budget allocation across a fragmented catalog.

The Challenge

The account faced a structural limitation common in large catalogs.

Performance varied widely across products, brands, and price tiers, but budget was distributed too evenly. High-value products were not receiving enough investment to scale, while lower-performing SKUs continued to consume spend.

Seasonality added pressure.

As the business entered winter—a period that historically reduced efficiency—ROAS typically declined by 15–20% year over year. Even with stable spend, profitability consistently dropped during this period.

The account was stable—but inefficient.

The challenge was to improve efficiency while continuing to grow, without relying on additional budget.

Why Quartile

In large product catalogs, performance is driven by prioritization.

Quartile identified that the account lacked a system to differentiate product value. Without segmentation, the platform could not allocate budget effectively across thousands of SKUs.

The solution was to create structure.

By organizing the feed and campaigns around product value, brand, and price tiers, Quartile enabled the system to prioritize high-impact products while maintaining coverage across the full catalog.

This allowed performance—not uniform distribution—to guide investment.

The Solution

Quartile rebuilt the account foundation across both feed and campaigns.

The product feed was restructured to improve data quality and segmentation, enabling clearer grouping by brand, pricing tiers, and performance behavior. This gave campaigns stronger signals and improved optimization accuracy.

Campaigns were then aligned to this structure.

Products were separated into performance tiers, ensuring that higher-value and higher-converting SKUs received prioritized budget. Lower-performing products remained active but were managed within tighter constraints to prevent inefficiency.

Optimization focused on consistency over time.

Rather than chasing short-term gains, Quartile continuously refined budget allocation based on performance signals. This allowed improvements to compound month over month, creating sustained gains rather than isolated spikes.

The result was a system where growth came from better allocation—not higher spend.

Results & Impact

The restructuring delivered consistent and measurable improvements:

• ROAS improved by 27%, reversing the typical seasonal decline  

• Ad-attributed sales increased 32% year over year in January  

• Stable spend maintained, confirming efficiency—not budget—increased performance  

• Every month delivered year-over-year growth, including historically weaker periods  

From September through December, performance improved steadily, with year-over-year gains in both sales and efficiency. January marked the strongest period, with peak performance across both metrics.

These results demonstrate a clear shift: by aligning structure with product value, the account achieved sustained growth without increasing investment.  

Ongoing Value & Future State

With a strong structural foundation now in place, the account is positioned for continued, scalable growth.

Quartile continues to refine segmentation, expand high-performing product groups, and optimize budget allocation as the catalog evolves. The system is designed to maintain efficiency while supporting long-term expansion.

What began as a structural fix is now a repeatable growth engine.