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My sand filter has a crack in it and needs replacement--wondering if we should switch to a DE filter. I know DE cleans better, but I feel a little intimidated with a switch....the sand is so easy, and I think my pool stays pretty clean. I have a Hayward 1 HP Power Flow Matrix for a 21' AG pool.

I thought I read here at TFP that you lose half your FC every day? I supershocked my pool to 29 ppm on September 8th and am surpised it has already come down to about 6-7 ppm here on the 11th....I'm doing an overnight FC test to make sure I'm done shocking, but by the looks of the water, I...

After shocking, does dead algae always appear whitish? How about mustard algae? Thanks.

For the past week, water has been clear, lose 2 FC consistently per day, no slime on walls, but returning "yellow/brown/green dirt-like" spots on bottom of pool...they brush away easily, but come back, usually around the same spots, so I brought my FC up to shock level...this morning, I read...

When a pool service company closes the pool, they add their chemicals right then, without circulating them. I intend to shock (with bleach) and filter my pool the night before they come. At that point, they'll need to get into the pool to take out the ladder, stick their arms in the water to...

How long can a 3 year old vinyl liner sit without water (due to the liner coming out of its bead and the pool emptying out), before it is considered unusable due to shrinkage or other things? Thanks for your input!

I am understanding that there is a working relationship between CYA and FC....the higher the CYA, the more FC you need....but in any case, I thought that pools with FC above 4 FC were not safe to swim in? So, isn't one required to lower the CYA to keep the FC requirement around the ideal 2.0...

Hi, I can't understand why I'm losing prime while vacuuming. To set up the vacuum, I turn the pool off, put the vac adapter in the vac hole of the skimmer plate, put the skimmer cover down inside the skimmer, turn the pool on, and it keeps prime. However, if I attach either my regular hose to...

I think I made a big mistake by lubing the spokes on the top of my multiport valve (I did so because the arm seemed a little tight to move on pool opening)...I am getting a little sand in the pool, there is always some water in the valve "spokes"...also, I just added CYA to my skimmer, and I see...