Hi, Sheila,

Lot's of nice folks here will help you keep your pool clear.

Your pool is 4,500 gallons.

Stop back by Wal-Mart and get the HTH 5-way test kit. (about $15) It will test for chlorine, pH, Alkalinity, Calcium and CYA. Post those test results back and folks will help you. Without those results, tho, we'd all be guessing.

Test strips are just too unreliable to help you (or us) much.