Something just tells me I have a larger issue. I’m not seeing any change in the green of the pool.
Couple things-
in the past. This is something that should be done every couple seasons anyway.
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Couple of things I feel like I need to add. I’ve removed my ladder. I felt like it was contributing to the algae. I have no lights or other fixtures in the pool. The pool store did inform me of the possibility of tunneling. So last weekend I cleaned out the top layer of the filter. There were quite a few clumps of sand bound together by what I believe to be floc. I’ll hopefully be able to get to the deep clean this Sunday. I had considered doing a sand swap, but I’ll try the deep cleaning method.Couple things-
*slam level for cya of 70 is 28ppm.
*slam level for cya of 90 is 35ppm
Going way over just wastes liquid chlorine & risks damaging your liner, swimmers & equipment.
Going under doesn’t really cut the mustard.
A ppm or two over is one thing but higher isn’t better.
Maintaining the correct slam level for your cya is the key.
Let’s be certain we know what that is.
You also just truly began the
SLAM Process. It’s not an overnight success. So patience, although sometimes hard to have, is important.
You said you used green to clean. Part of that is floc. This can gum up your sand & possibly ruin it.
I suggest you do a deep cleaning of the sand especially if you have used other pool potions
You mentioned attempting DE - I would wait until its no longer green & you have done the deep cleaning .Deep Cleaning a Sand Filter
This post will walk you through the anatomy of a sand filter, and then provide a video at the end for how to deep clean your sand filter. The filter used in the photos and videos is a Hayward S180T top mount sand filter. The images are of a similar filter. Obviously not all filters are...
Here’s the how to when it’s time
Also, filling out your signature is helpful for those helping youAdd DE to a Sand Filter
A clean pool filter will increase the efficiency of your pool! ... your filter are to backwash it, clean the manifolds and grids, and add new DE.
Is this an inground pool or above ground pool?Create Your Signature - Further Reading
*Be sure you’re doing all the things*
*Check & scrub every nook & cranny where algae may hide (light niches, steps, drain covers, ladder handrails, skimmer throats/weirs, abandoned lines, autofill, overflow drains, etc.)
*If water can go there, algae can thrive there.
*Run slam level water through all water features & lines for at least a couple hours a day during the SLAM Process.
*Brush & or vac daily (this breaks up biofilms that algae uses to protect itself from chlorine)
*Backwash/clean filter when pressure rises 25%over clean pressure.
If you’re confident CYA is 70, then we believe you. Even if it was 60 or 80 it doesn’t matter all that much. Just need to know if it’s below 30 or over 100 really.
That makes them algae central. 
Plan is to upgrade to SWG next season. Keeping up with manually dosing LC is a lot. And I've only been doing this for a few days.You’re doing great
For the cya - if the dot disappeared between two values you always round up.
So example: anywhere between 70 & 80 = 80 for chlorination purposes.
Be sure to clean the ladder inside & out - many have used bleach & a pressure washer with much success. Some folks need to drill extra holes to get good access & circulation. Before putting them back in don’t fill them with sand
If you need to weigh them down its best to use external sealed weights so they are easily removed and don’t harbor algae.
When you’re ready you can post pics of them & get more ideas of how to do this with your particular step setup.
When you get this slam thoroughly completed if you maintain the proper fc/cya ratio at all times thereafter you shouldn’t need to deal with algae ever again!
We’re not just batting it down, we’re eradicating it and proving it’s gone!
Keep reading up on
Pool Care Basics & you’ll be an expert in taking care of your pool too
To be fair the
This, exactly. My first SLAM felt never ending with constant trips to the pool store for refills. After the slam, I only used 32oz a day may and June and it’s been 64oz a day for July and thus far into august. For me a 2.5 gallon refill is $9, so it’s not too bad in a week.
Here’s the problem I’m finding. We’re coming close the end of pool season and now the “big box” stores are out of LC. Which leaves me to turn to the much more expensive pool stores, assuming they’re still carrying in stock.
That’s a pickle you’re in. All of my big box stores stock chlorine year-round. I’ve never considered folks that live in other states. @Newdude, I know you have a SWCG now, but what do you cold blooded folks do for chlorine in the offseason?
Pool store might not be that bad. Can also use plain plain plain plain (did I mention plain?) bleach.
Short term I'd use pool stores. Long term I'd find a bulk supplier. It might take some effort, but there would be a car wash or office cleaning company somewhere (open year round) willing to sell me bulk.
Or 'disinfectant bleach' from the cleaning aisle. Those are usually straight 6% with no bells amd whistles.
