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Suffered through a problematic season. My water level fell below the skimmer due to excessively high temps and not a lot of rain. My pool is in desperate need of a makeover (liner, concrete deck, pump timer, etc.), and I decided not to spend $300+ for water when no one was going to go swimming...

I'm in the process of replacing the Filter Grids and the Air Relief assembly in my Hayward DE4800 filter. The new Air Relief assembly (the little "finger" that attaches to the top of the manifold) sticks straight up, and hits the inside of the upper filter housing. My question is, if I...

20000 gal in ground pool, vinyl liner, DE filter. Current readings : FC 4.0, CC 0.0, pH 7.6, TA 40, CYA 30, CH 25. I keep the FC between 4.0 and 5.0, and although the TA is below what is recommended, I fell that since the pH is stable, there's not a need to add any baking soda. I've been...

First water test of the season yielded these numbers: FC. 0.0 CC 0.0 CH 100 TA 50 CYA 20 pH 7.35 With CC at 0, should I SLAM? Water is a little green. Having said that, which parameter should I address first? I know FC and TA need to be raised, but not sure if I should try and raise both...

Opened the pool last week. Water was clear with some expected debris at the bottom (thanks to TFP for a very good closing last year!) Vacuumed and brushed, backwashed and recharged the DE filter. CH is 100, TA is 90, CYA is 35 and pH is 7.2. Virtually no chlorine (FC is 0.5). Using Pool Math to...

I will be closing my IG pool this week, and have decided to purchase a portable air compressor with a 1/4" adapter to attach to the threaded drain plug at the bottom of the skimmer basket. I previously used a shop vac, but it didn't have enough "grunt" to completely blow out the main drain. Not...

After 4 weeks of SLAMing (with a 4 day break in the action caused by a planned vacation), my pool is clear and algae free! I passed the OCLT (no overnight drop in FC) and the numbers support an end of the SLAM: FC 13 ... CC 0.5 ... CH 200 ... TA 80 ... CYA 35 ... pH 7.3. If I'm not mistaken, now...

I began SLAMing about three weeks ago. The water was such a dark green it almost looked black, and I couldn't see even to the first level of the steps. The water is now a very slight shade of green, and clear (not cloudy) - the main drain is easily visible in 7+ feet of water. However it seems...

I am going to be away for four days beginning tomorrow. I have been SLAMing for the past 11 days(!) and I don't want the pool to regress in my absence, but I'm hesitant to run the pump 24/7 when I'm not home. Any thoughts on the most effective time of day to run the pump for 8 - 10 hours? Also...

I'm on day 11 of SLAMing what was a literal swamp, and I think I can see light at the end of the tunnel (actually I can see the main drain! ;)). The water has turned a tint of bright green (as opposed to a muddy green two weekends ago), and the CC has dropped to 1.0. Numbers: FC 13 ... CC 1 ...

I recently started a SLAM and I noticed that after backwashing there is a small amount of DE coming out of the returns closest to the pump. I have a DE4800, for which I understand the fresh charge should be 5 pounds of DE, and after a backwash I add about a pound of DE. The grids were replaced...

I think I know the answer but wanted to get the groups input. I am in the midst of SLAMing (day 5). Just finished testing the water: FC = 10 , CC = 2.5 , TC = 12.5 , TA = 120 CYA = 50 , pH = 7.3 My question is regarding adding chlorine. I want to keep the FC up around 12 ppm, and I need to add...

I learned from this site that the best way to add stabilizer is to put the desired amount into a sock and let it absorb through the skimmer. Adding liquid chlorine is best achieved by slowly pouring it around the perimeter of the pool. Not sure about adding baking and washing soda? Should I...

Welcome to the weekend...I am SLAMming my pool, and added 2.5 lbs of stabilizer (based on numbers from PoolMath) two hours ago. My question is, how long should I wait to get an accurate CYA measurement? I started at < 20 ppm, and it my recent reading has not changed.

Curious whether there is a TFP approved substitute for Stabilizer? I know that the 3" stabilized "hockey pucks" contain CYA and with limited use can maintain CYA, but I'm not sure what the experts here recommend. I'm considering getting a few pounds from Walmart to get started - not sure of the...

My question concerns the amount of DE to replace in the grid filter after backwashing. I was told by my old pool store that for my DE-4800 48 sq ft filter that I should replace roughly 75% of the total DE capacity after backwashing. For a "fresh" charge, the filter requires 4 pounds of DE, so...

I opened my pool for the first time after two full seasons covered, and as you may imagine it's a green mess. I've taken some time to read through Pool School, got my TF-100 Test Kit and ran some numbers through Pool Math, as I am ready to SLAM the pool, but wanted to get some input from the...

I am opening my in ground pool for the first time after two years being covered. The water is dark green with quite a bit of crud at the bottom, which I can't see, but can confirm with the leaf rake. I have a new set of grids for my DE filter and a TF-100 test kit on order. I also read the Pool...