Liquid vs Cal-Hypo vs Dichlor
They all deliver chlorine, but each drags a side effect along with it. Liquid adds nothing but salt, cal-hypo adds calcium, and dichlor adds stabilizer (CYA). The right pick depends on which of those your water can afford to take on right now.
Side by side
| Liquid Chlorine | Cal-Hypo | Dichlor | |
|---|---|---|---|
| Adds to water | Nothing but a little salt | Calcium hardness | CYA (stabilizer) |
| Strength | ~10–12% (bleach ~6%) | ~65–73% available chlorine | ~56–62% available chlorine |
| Form | Liquid — pour and go | Granular / cal-hypo shock | Granular / tablets, stabilized |
| CYA impact | None | None | Raises CYA every dose |
| Calcium impact | None | Raises calcium hardness | None |
| Shelf life | Short — degrades in weeks | Long if kept dry | Long if kept dry |
| Best for | Routine dosing and shocking | Shocking soft water / vinyl pools | Outdoor top-ups when CYA is low |
The verdict
you want a clean workhorse for day-to-day dosing and shocking — it adds no CYA and no calcium, so it never traps you. The trade-off is a short shelf life, so buy it fresh and often.
you need a strong granular shock and your calcium hardness is low — common in soft-water areas and vinyl pools — since each dose nudges calcium up as well.
your CYA is low and you want a convenient stabilized granular for outdoor top-ups. Watch the CYA climb — once it is in range, switch to liquid or cal-hypo so stabilizer does not overshoot.
Pros & cons
- Adds no CYA and no calcium
- Easy to pour and dose
- Good for both routine and shocking
- Short shelf life — degrades fast
- Heavy and bulky to carry
- Can splash and bleach clothing
- Strong, cheap granular shock
- Long shelf life kept dry
- Raises calcium in soft-water pools
- Adds calcium you may not want
- Can cloud water if not pre-dissolved
- Never mix with other chlorine types
- Stabilized — resists UV outdoors
- Convenient granular or tablet form
- Long shelf life kept dry
- Raises CYA every single dose
- CYA creep can stall your chlorine
- Pricier per pound of chlorine
Think in side effects, not just chlorine. Liquid is the neutral all-rounder, cal-hypo is the calcium-adding shock for soft water, and dichlor is the stabilized outdoor top-up that quietly raises CYA. Most owners run liquid or cal-hypo day to day and reach for dichlor only while CYA is genuinely low.
Common questions
What is the difference between liquid chlorine, cal-hypo, and dichlor?
They deliver chlorine with different side effects. Liquid chlorine adds nothing but a little salt, cal-hypo raises calcium hardness, and dichlor raises CYA (stabilizer). Choosing between them is mostly about which of those your water can take on.
Which chlorine does not raise CYA?
Liquid chlorine and cal-hypo add no CYA, so they will not push your stabilizer up. Dichlor and trichlor are stabilized and raise CYA with every dose, which is useful when CYA is low but a problem once it is in range.
Is cal-hypo or dichlor better for shocking?
Cal-hypo is the usual shock choice because it is strong and adds no CYA — only calcium. Dichlor also works but raises CYA each time, so repeated shocking with it can over-stabilize the water and weaken your chlorine.
Why does liquid chlorine go bad so fast?
Liquid chlorine (sodium hypochlorite) naturally degrades over weeks, faster in heat and sunlight, so an old jug is weaker than the label says. Buy it fresh, store it cool and dark, and use it within a few weeks for reliable dosing.