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Yes, it is often possible to replace an undermount sink without removing the countertop, but success can depend on the countertop material. For materials like granite, the process is relatively straightforward. However, laminate or uniquely shaped countertops might need to be removed or modified.

The process typically involves shutting off the water supply, disconnecting the drain and plumbing pipes, cutting through the old silicone seal, and carefully lowering the sink from below. This requires a good understanding of plumbing and the right tools. If you are not confident in performing the replacement yourself, it is recommended to hire a countertop specialist or a plumber to handle the task.

Concrete countertops require regular upkeep to maintain their appearance and durability, and are generally considered harder to maintain than other materials. For daily cleaning, use a mild, pH-neutral cleaner and avoid harsh, acidic products that can damage the sealant. It is crucial to wipe up spills immediately, especially from acidic substances, as concrete stains easily. To protect against stains and moisture, the countertops must be resealed periodically—at least once a year, if not more frequently. Additionally, use a cutting board to avoid scratching the surface. Be aware that concrete is also prone to cracking over time, which may require repairs.

The best way to save money on countertop installation is to choose an affordable material. For example, if you have a busy kitchen and need durability, choose a more affordable but lasting material like granite countertops. Likewise, if you don't use your countertops often, you can use a softer material that costs less than more sturdy ones. 

Another way to cut costs is to remove and dispose of the existing countertops yourself, if possible. That way, countertop installers can get straight to placing the new feature, reducing labor costs.

Avoid using harsh, gritty, or abrasive cleaners and sponges on Formica countertops. This includes steel wool, scouring pads, and strongly alkaline or acidic cleaning products like chlorine bleach, oven cleaner, drain cleaner, furniture polish, or vinegar. These can compromise the surface, leading to scuffs, discoloration, and other damage that will reduce the countertop's longevity. Additionally, never place hot items, such as pots and pans directly from the oven or stovetop, onto the laminate surface, as the high heat can cause it to scorch.