Apple cider vinegar can be diluted half-and-half with water for external application, and, when stronger measures are needed, it can be used full-strength.
1 Just the stone for a flagstone patio can cost $3 -$5 a square foot or more, depending on location and the type and quality of stone, or about $600 -$1,000 for an average patio up to 10'x20,' and $1,200 -$2,000 for a larger 20'x20' area.
A stamped concrete patio is embedded with a pattern and color to make it look like natural stone. Stamped concrete patio cost is about $8 to $12 per square foot for a basic design (one pattern, one color) up to $20 per square foot or more for elaborate designs with multiple colors, patterns or hand-applied stains.